Neil Patrick Harris pranked 'The Voice' coaches and it was a truly terrifying experience for him

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Now we know what spooks Neil Patrick Harris!

Neil talked to ET about his new show, Best Time Ever, where among other things, the 42-year-old actor pranks unsuspecting celebrities. And he admits that while doing the show is pretty much "a party," pulling one over on say,The Voice judges, can be pretty scary!

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"I was Jurgen Vulmer, who was the host of The Voice Austria, which doesn't exist," he said, explaining the prank, saying that he basically asked the judges a bunch of random, strange questions. "I had almost three hours of prosthetic makeup on. I looked nothing like myself, and had a different accent."

"It was incredibly terrifying," he continued. "They thought I was insane."

With regards to his new show, Neil said he recognizes a changing TV landscape, where you no longer have to be at home, at a certain time, to watch a program, and hopes Best Time Ever alters peoples viewing habits.

"What's fun about our show is if you commit to watching a show, you're a part of the group," he said. "If you're in the theater, you might be in the show. If you're watching at home, you may be on the show."

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Neil should do a great job hosting after his string of awards show hosting gigs, including the Oscars, Emmys, and the Tony Awards. The How I Met Your Mother star opened up about the balancing act that presents someone with.

"The job is just multi-leveled," he said. "You have to entertain. You have to honor. And now you sort of have to educate. To do all of that in the short little time frame that you have between acceptance speeches is a tricky conceit."

Well, you seem to knock it out of the park each and every time, Neil!

Best Time Ever premieres tonight on NBC at 10/9 c.

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Neil Patrick Harris pranked 'The Voice' coaches and it was a truly terrifying experience for him
LATE NIGHT WITH SETH MEYERS -- Episode 106 -- Pictured: (l-r) Actor Neil Patrick Harris during an interview with host Seth Meyers on October 1, 2014 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - OCTOBER 02: Neil Patrick Harris and David Burtka attend 'The Country House' Opening Night - Arrivals & Curtain Call at Samuel J. Friedman Theatre on October 2, 2014 in New York City. (Photo by John Lamparski/WireImage)
NEW YORK, NY - SEPTEMBER 29: Actor Neil Patrick Harris enters the 'Late Show With David Letterman' taping at the Ed Sullivan Theater on September 29, 2014 in New York City. (Photo by Ray Tamarra/WireImage)
NEW YORK, NY - SEPTEMBER 26: Actor Neil Patrick Harris attends the Opening Night Gala Presentation And World Premiere Of 'Gone Girl' 52nd New York Film Festival at Alice Tully Hall on September 26, 2014 in New York City. (Photo by Mike Pont/FilmMagic)
NEW YORK, NY - AUGUST 15: Neil Patrick Harris poses at his caricature unveiling celebrating his last performances in the Broadway Musical 'Hedwig and The Angry Inch' at Sardi's on August 15, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - JULY 17: Actor Neil Patrick Harris tapes an interview at 'Good Morning America' at the ABC Times Square Studios on July 17, 2014 in New York City. (Photo by Ray Tamarra/GC Images)
NEW YORK, NY - JUNE 16: David Burtka (L) and Neil Patrick Harris attend 2014 'TrevorLIVE NY' Benefit at Marriott Marquis Hotel on June 16, 2014 in New York City. (Photo by Gary Gershoff/WireImage)
NEW YORK, NY - JULY 17: Neil Patrick Harris is seen at Huffington Post Live on July 17, 2014 in New York City. (Photo by Alessio Botticelli/GC Images)
NEW YORK, NY - JUNE 08: Lena Hall, Michael Mayer, Neil Patrick Harris, Ben Cameron Mitchell and Stephen Trask in the press room during the 68th Annual Tony Awards on June 8, 2014 in New York City. (Photo by Walter McBride/Getty Images)
NEW YORK - JUNE 8: THE 68TH ANNUAL TONY AWARDS, broadcast live from Radio City Music Hall, Sunday, June 8 (8:00-11:00 PM, live ET/ delayed PT) on the CBS Television Network. Golden Globe and Tony Award-winning actor Hugh Jackman hosts. Pictured: Neil Patrick Harris for Hedwig and the Angry Inch. (Photo by Heather Wines/CBS via Getty Images)
NEW YORK, NY - JUNE 08: Neil Patrick Harris and David Burtka attend American Theatre Wing's 68th Annual Tony Awards at Radio City Music Hall on June 8, 2014 in New York City. (Photo by Walter McBride/Getty Images)
NEW YORK - JUNE 8: THE 68TH ANNUAL TONY AWARDS, broadcast live from Radio City Music Hall, Sunday, June 8 (8:00-11:00 PM, live ET/ delayed PT) on the CBS Television Network. Golden Globe and Tony Award-winning actor Hugh Jackman hosts. Pictured: Best Performance by an Actor in a Leading Role in a Musical Neil Patrick Harris for Hedwig and the Angry Inch. (Photo by Heather Wines/CBS via Getty Images)
NEW YORK, NY - JUNE 08: Neil Patrick Harris, winner of the award for Best Performance by an Actor in a Leading Role in a Musical for “Hedwig and the Angry Inch”, poses in the Paramount Hotel Winners' Room at the 68th Annual Tony Awards on June 8, 2014 in New York City. (Photo by Mike Coppola/Getty Images for Tony Awards Productions)
NEW YORK, NY - JUNE 08: Neil Patrick Harris attends the 68th Annual Tony Awards at Radio City Music Hall on June 8, 2014 in New York City. (Photo by Kevin Mazur/Getty Images for Tony Awards Productions)
NEW YORK, NY - JUNE 08: Neil Patrick Harris and the cast of 'Hedwig and the Angry Inch' perform onstage during the 68th Annual Tony Awards at Radio City Music Hall on June 8, 2014 in New York City. (Photo by Kevin Mazur/Getty Images for Tony Awards Productions)
NEW YORK, NY - JUNE 08: Neil Patrick Harris and the cast of 'Hedwig and the Angry Inch' perform onstage during the 68th Annual Tony Awards at Radio City Music Hall on June 8, 2014 in New York City. (Photo by Kevin Mazur/Getty Images for Tony Awards Productions)
NEW YORK, NY - JUNE 08: (L-R) Actors Tony Shalhoub, Jessie Mueller and Neil Patrick Harris attend the American Theatre Wing's 68th Annual Tony Awards at Radio City Music Hall on June 8, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - JUNE 03: Neil Patrick Harris accepts his three 2014 Broadway.com Audience Choice Awards for 'Favorite Diva Performance', 'Favorite Actor in a Musical' and 'Favorite Musical Revival' for 'Hedwig and The Angry Inch' backstage at The Belasco Theater on June 3, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - JUNE 02: Neil Patrick Harris and David Burtka attend The Launch Of EAT (RED). DRINK (RED). SAVE LIVES at Eataly Birreria on June 2, 2014 in New York City. (Photo by Astrid Stawiarz/Getty Images for (Red))
TODAY -- Pictured: Neil Patrick Harris appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
NEW YORK, NY - MAY 05: David Burtka and Neil Patrick Harris attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
NEW YORK, NY - APRIL 26: (EXCLUSIVE COVERAGE) Neil Patrick Harris and Katy Perry pose backstage at 'Hedwig and The Angry Inch' on Broadway at The Belasco Theater on April 26, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - APRIL 22: Neil Patrick Harris attends the Broadway Opening Night After Party for 'Hedwig and the Angry Inch' at the Belasco Theatre on April 22, 2014 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - APRIL 22: Neil Patrick Harris, Lena Hall and band during the Broadway Opening Night Performance Curtain Call for 'Hedwig and the Angry Inch' at the Belasco Theatre on April 22, 2014 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - APRIL 22: Neil Patrick Harris during the Broadway Opening Night Performance Curtain Call for 'Hedwig and the Angry Inch' at the Belasco Theatre on April 22, 2014 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - APRIL 07: Actor Neil Patrick Harris attends U.S. Senator Charles E. Schumer announces his campaign to give Broadway and live theater productions a major tax break that will encourage investment and spur job creation at Sardi's on April 7, 2014 in New York City. (Photo by Monica Schipper/Getty Images)
NEW YORK, NY - MARCH 10: Neil Patrick Harris (L) attend the Hasty Pudding Institute of 1770 Honors David Heyman at the Order of the Golden Sphinx Gala at the Appel Room at Jazz at Lincoln Center on March 10, 2014 in New York City. (Photo by Jemal Countess/Getty Images for The Hasty Pudding Institute of 1770)
WEST HOLLYWOOD, CA - MARCH 02: Neil Patrick Harris (R) and husband David Burtka arrive at the 22nd Annual Elton John AIDS Foundation's Oscar viewing party held on March 2, 2014 in West Hollywood, California. (Photo by Michael Tran/FilmMagic)
WEST HOLLYWOOD, CA - MARCH 02: Neil Patrick Harris and David Burtka attend the 2014 Vanity Fair Oscar Party hosted by Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
NEW YORK, NY - FEBRUARY 03: Neil Patrick Harris during The Drama League's 30th Annual Musical celebration of Broadway honoring Neil Patrick Harris at The Pierre Hotel on February 3, 2014 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - FEBRUARY 03: David Burtka and husband Neil Patrick Harris attend The Drama League's 30th Annual Musical celebration of Broadway honoring Neil Patrick Harris at The Pierre Hotel on February 3, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
LOS ANGELES, CA - JANUARY 26: (L-R) David Burtka and Neil Patrick Harris arrive at the 56th Annual GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Dan MacMedan/WireImage)
SANTA MONICA, CA - JANUARY 21: (L-R) Chef David Burtka, son Gideon Scott, partner actor Neil Patrick Harris and daughter Harper Grace attend opening night of Cirque du Soleil's 'Totem' at the Santa Monica Pier on January 21, 2014 in Santa Monica, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - DECEMBER 16: Model Heidi Klum and actor Neil Patrick Harris attend the 'Under The Gunn' Finale Fashion Show at Los Angeles Theatre on December 16, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
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