Jimmy Kimmel and John Krasinski took their annual holiday prank war to a new level on Tuesday's episode of "Jimmy Kimmel Live."
Krasinski relished the fact that he pranked Kimmel not once, not twice, but three times this year already. It started with a Santa, who happened to not be wearing pants, getting hoisted up to the window of Kimmel's office. Krasinski kept things going by getting a live reindeer into Kimmel's private bathroom.
Click through to relive the epic prank war through photos:
Jimmy Kimmel John Krasinski Holiday Prank War 2015
Jimmy Kimmel, John Krasinski escalate annual holiday prank war
Kimmel was stunned to find a live reindeer in his dressing room.
Krasinski also hired a pantsless Santa to surprise the talk show host outside his office window.
The final prank included dressing Kimmel's office in full-on winter wonderland gear and surprising dressed as a life-sized Nutcracker.
Kimmel was in good spirits throughout.
Kimmel retaliated by printing Krasinski's home address on yard sale signs he posted all around LA.
... And by dumping eggnog all over the star on his show.
Happy holidays, John Krasinski!
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Krasinski's greatest prank, however, was turning Kimmel's office into a wintery wonderland with Krasinski disguised as a giant nutracker.
Kimmel found those pranks funny, but he took things up a notch. First, he posted flyers for a garage sale with Krasinski's picture and home address all over Los Angeles.
But Kimmel's sweet revenge took on a nog-like flavor when he dumped a big bucket of egg nog all over Krasinksi in front his studio audience.
RELATED: John Krasinski through the years
John Krasinski through the years
Jimmy Kimmel, John Krasinski escalate annual holiday prank war
THE OFFICE -- Season 1 -- Pictured: John Krasinski as Jim Halpert -- Photo by: Paul Drinkwater/NBCU Photo Bank
John Krasinski (Photo by SGranitz/WireImage)
Jenna Fischer and John Krasinski of 'The Office' (Photo by Gregory Pace/FilmMagic)
John Krasinski wearing Giorgio Armani 2615S Sunglasses (Photo by Djamilla Rosa Cochran/WireImage for Fingerprint Communications)
BEVERLY HILLS, CA - JULY 24: Actress Jenna Fischer (L) and actor John Krasinski attend the panel discussion for 'The Office' during the NBC 2005 Television Critics Association Summer Press Tour at the Beverly Hilton Hotel on July 24, 2005 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
Left to right: Steve Carrell, B.J. Novak, Jenna Fischer, John Krasinski, and Rainn Wilson hold the award for outstanding comedy series "The Office" at the 58th Annual Primetime Emmy Awards Sunday, Aug. 27, 2006, in Los Angeles. (AP Photo/Reed Saxon)
John Krasinski during NBC 2007-2008 Primetime Preview Red Carpeti Upfronts - Arrivals at Radio City Music Hall in New York City, New York, United States. (Photo by Michael Loccisano/FilmMagic)
Actor John Krasinski in the press room at the 14th Annual Screen Actors Guild Awards at the Shrine Auditorium on January 27, 2008 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
THE OFFICE -- 'Parking' Episode 4014 -- Airdate 04/17/2008 -- Pictured: John Krasinski as Jim Halpert (Photo by Chris Haston/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - MAY 12: Actor John Krasinski attends the NBC Universal Experience at Rockefeller Center on May 12, 2008 in New York City. (Photo by Jason Kempin/WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode -- Air Date -- Pictured: (l-r) Actor John Krasinski during an interview with host Jay Leno on March 13, 2009 -- Photo by: Paul Drinkwater/NBCU Photo Bank
LOS ANGELES, CA - SEPTEMBER 20: Actor John Krasinski arrives at the 61st Primetime Emmy Awards held at the Nokia Theatre on September 20, 2009 in Los Angeles, California. (Photo by Jeff Vespa/WireImage)
NEW YORK CITY, NY - DECEMBER 7: John Krasinski poses for a photo during a portrait session at the Ritz Carlton Hotel in New York City, New York on December 7, 2009. (Photo by Munawar Hosain/Fotos International/Getty Images) Reproduction by American tabloids is absolutely forbidden.
THE OFFICE -- 'The Meeting' Episode 602 -- Pictured: John Krasinski as Jim Halpert -- Photo by: Trae Patton/NBC/NBCU Photo Bank
HOLLYWOOD - JANUARY 15: Actors John Krasinski (L) and Emily Blunt arrive at the 15th annual Critics' Choice Movie Awards held at the Hollywood Palladium on January 15, 2010 in Hollywood, California. (Photo by Jason Merritt/Getty Images for VH1)
LATE NIGHT WITH JIMMY FALLON -- Episode 830 -- Pictured: (l-r) John Krasinski and host Jimmy Fallon take turns lip syncing classics from Katy Perry, Boyz II Men and others on May 7, 2013 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
Actor John Krasinski arrives at the 17th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 30, 2011 in Los Angeles, California.
WASHINGTON, DC - DECEMBER 3: (AFP OUT) Emily Blunt and John Krasinski arrive for the formal Artist's Dinner honoring the recipients of the 2011 Kennedy Center Honors hosted by United States Secretary of State Hillary Rodham Clinton at the U.S. Department of State on December 3, 2011 in Washington, DC. President Barack Obama will host the five recipients of the 34th Kennedy Center Honors at a White House reception Sunday before attending the evening gala at the John F. Kennedy Center for the Performing Arts. The 2011 honorees are actress Meryl Streep, singer Neil Diamond, actress Barbara Cook, musician Yo-Yo Ma, and musician Sonny Rollins..(Photo by Ron Sachs-Pool/Getty Images)
LOS ANGELES, CA - JANUARY 29: Actors Emily Blunt and John Krasinski arrives at the 18th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 29, 2012 in Los Angeles, California. (Photo by Jeff Vespa/WireImage)
THE OFFICE -- 'Roy's Wedding' Episode 902 -- Pictured: (l-r) John Krasinski as Jim Halpert, Jenna Fischer as Pam Halpert -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
TORONTO, CANADAÂÂSEPT. 6, 2012ÂÂEmily Blunt (with husband John Krasinski) stars in Looper, a futuristic action thriller, which premiered at the Toronto Film Festival. (Photo by Carolyn Cole/Los Angeles Times via Getty Images)
NEW YORK, NY - DECEMBER 04: (NO TABLOIDS) John Krasinski at the 'Promised Land' Press Conference at the Waldorf Astoria Hotel on December 4, 2012 in New York City. (Photo by Vera Anderson/WireImage)
BEVERLY HILLS, CA - SEPTEMBER 30: Actor John Krasinski attends the premiere of 'Captain Phillips' at the Academy of Motion Picture Arts and Sciences on September 30, 2013 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - DECEMBER 08: Actors Emily Blunt and John Krasinski attend the 'Into The Woods' world premiere at the Ziegfeld Theater on December 8, 2014 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - OCTOBER 08: Emily Blunt and husband John Krasinski pose at The Opening Night of the MTC production of Sam Shepard's 'Fool For Love' on Broadway at The Samuel J. Friedman Theatre on October 8, 2015 in New York City. (Photo by Bruce Glikas/FilmMagic)