Joseph Gordon-Levitt was the most excited 16-year-old 'Jeopardy!' contestant

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Joseph Gordon-Levitt was the most excited 16-year-old 'Jeopardy!' contestant
LOS ANGELES, CA - DECEMBER 03: Actor Joseph Gordon Levitt signs and discusses his new DVD 'HitRECord On TV: Season One!' at Skylight Books on December 3, 2014 in Los Angeles, California. (Photo by Vincent Sandoval/Getty Images)
LOS ANGELES, CA - DECEMBER 03: Actor Joseph Gordon Levitt signs and discusses his new DVD 'HitRECord On TV: Season One!' at Skylight Books on December 3, 2014 in Los Angeles, California. (Photo by Vincent Sandoval/Getty Images)
LOS ANGELES, CA - DECEMBER 03: Actor Joseph Gordon Levitt signs and discusses his new DVD 'HitRECord On TV: Season One!' at Skylight Books on December 3, 2014 in Los Angeles, California. (Photo by Vincent Sandoval/Getty Images)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt on stage at the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - MARCH 02: Actors Joseph Gordon-Levitt and Emma Watson speak onstage during the Oscars at the Dolby Theatre on March 2, 2014 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
SANTA MONICA, CA - MARCH 01: Actor/screenwriter Joseph Gordon-Levitt attends the 2014 Film Independent Spirit Awards at Santa Monica Beach on March 1, 2014 in Santa Monica, California. (Photo by Steve Granitz/WireImage)
LONDON, ENGLAND - OCTOBER 16: Joseph Gordon-Levitt attends a screening of 'Don Jon' during the 57th BFI London Film Festival at Odeon West End on October 16, 2013 in London, England. (Photo by Ferdaus Shamim/WireImage)
PARK CITY, UT - JANUARY 23: Joseph Gordon-Levitt seen on January 23, 2013 in Park City, Utah. (Photo by Robin Marchant/FilmMagic)
PARK CITY, UT - JANUARY 18: Actor/director Joseph Gordon-Levitt attends 'Don Jon's Addiction' Premiere during the 2013 Sundance Film Festival at Eccles Center Theatre on January 18, 2013 in Park City, Utah. (Photo by C Flanigan/FilmMagic)
HOLLYWOOD, CA - OCTOBER 21: Actor Joseph Gordon-Levitt attends the premiere of 'White Bird in a Blizzard' at ArcLight Hollywood on October 21, 2014 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
HOLLYWOOD, CA - OCTOBER 21: Actor Joseph Gordon-Levitt attends the premiere of 'White Bird In A Blizzard' at ArcLight Hollywood on October 21, 2014 in Hollywood, California. (Photo by Jason Kempin/Getty Images)
HOLLYWOOD, CA - OCTOBER 17: Craig Robinson (L) and Joseph Gordon-Levitt attend the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt on stage at the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt attends the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Michael Buckner/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt on stage at the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Michael Buckner/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt on stage at the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actors Craig Robinson (L) and Joseph Gordon-Levitt on stage at the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
HOLLYWOOD, CA - OCTOBER 17: Actor Joseph Gordon-Levitt (L) and writer/director Judd Apatow attend the 3rd Annual Hilarity for Charity Variety Show to benefit the Alzheimer's Association, presented by Genworth, at Hollywood Palladium on October 17, 2014 in Hollywood, California. (Photo by Jeff Vespa/Getty Images for Hilarity For Charity)
NEW YORK, NY - OCTOBER 07: Anthony Mackie, Seth Rogen, Joseph Gordon-Levitt filming Johnathan Levine's 'Untitled Christmas Eve Project' on October 7, 2014 in New York City. (Photo by Steve Sands/GC Images)
NEW YORK, NY - SEPTEMBER 02: Actor Joseph Gordon-Levitt on the set of 'Christmas Eve Project' on September 2, 2014 in Brooklyn, New York. (Photo by Bobby Bank/GC Images)
NEW YORK, NY - SEPTEMBER 02: Actor Joseph Gordon-Levitt on the set of 'Christmas Eve Project' on September 2, 2014 in Brooklyn, New York. (Photo by Bobby Bank/GC Images)
NEW YORK, NY - SEPTEMBER 02: Actor Joseph Gordon-Levitt on the set of 'Christmas Eve Project' on September 2, 2014 in Brooklyn, New York. (Photo by Bobby Bank/GC Images)
NEW YORK, NY - AUGUST 19: Joseph Gordon-Levitt leaves the 'Late Show with David Letterman' at Ed Sullivan Theater on August 19, 2014 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - AUGUST 19: Actor Joseph Gordon-Levitt enters the 'Late Show With David Letterman' taping at the Ed Sullivan Theater on August 19, 2014 in New York City. (Photo by Ray Tamarra/WireImage)
NEW YORK, NY - AUGUST 19: Joseph Gordon-Levitt leaves the 'Late Show with David Letterman' at Ed Sullivan Theater on August 19, 2014 in New York City. (Photo by Donna Ward/Getty Images)
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It was a throwback Thursday for Joseph-Gordon Levitt when he appeared on Conan on Dec. 4.

Late night host Conan O'Brien brought up the fact that the actor was on Jeopardy! when he was 16-years-old. Back in 1997, a young Gordon-Levitt was on the celebrity edition.

Joseph started acting at 7-years-old, and by the time he was on Jeopardy! he already starred in TV shows 3rd Rock From the Sun, Roseanne and The Powers That Be as well as various movies including Angels in the Outfield, A River Runs Through It and Beethoven.

With his signature long hair, he was an energetic teenager. As O'Brien said before they watched the clip, "You're 16, but I love your enthusiasm."

In the 17-year-old video, Jeopardy! host Alex Trebek provided the answer to the question, "Holden Caulfield, the hero of this Salinger novel, hates movies, phonies, and his classmate Ernest Morrow."

But all that can be heard over Trebek's voice is an excited "Ooo! Ooo!" and that's Joseph's voice!

He knew the answer, "What is Catcher in the Rye?!" He then exclaimed, "I'm so excited! That's my favorite book!"

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Just hearing Trebek's response, "Good for you," gave Joseph a good laugh as he reminisced on his game show debut.

While Joseph was already a celebrity before going on Jeopardy!,check out the celebs who were not famous yet before they appeared on game shows in the video below.

6 Celebs Who Were on Game Shows Before They Were Famous

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