While promoting "The Imitation Game" in 2014, Benedict Cumberbatch put his parroting skills to the test, whipping up as many impressions as he could in 60 seconds. Jack is No. 4.
"Can you imagine Jack Nicholson playing 'Call of Duty'?" Josh Gad asked... and answered.
When Elijah Wood shared a sofa with Robin Williams on "The Graham Norton Show," Jack became a topic of conversation.
Jim Carrey called getting into character as Jack "transitioning."
Kevin Pollak tells Conan O'Brien just how awkward it got when his mom was hanging around the notorious ladies' man.
Kevin Spacey not only pulls off an excellent Jack impression, he did it in front of Jack! Here they are at the "38th AFI Life Achievement Award: A Tribute to Mike Nichols."
Pollak became Tom Cruise's audience of two (the other being Demi Moore) when he mimicked Jack in "A Few Good Men."
While in Japan promoting "Django Unchained," Leonardo DiCaprio didn't have to say a word when imitating Jack -- his eyebrows did all the talking.
Tina Fey joined Jimmy Fallon on "The Tonight Show" for a game of "First Impressions." Her Jack impression was half bad.
A furrowed brow and an iconic Jack quote was all Wilson needed when doing Jack on "The Office."
The "Tonight Show" host wrapped up an appearance on Jerry Seinfeld's "Comedians in Cars Getting Coffee" with a cup o' joe, a stack of pancakes… and a Jack Nicholson impression (10:40).
... And we're tossing in a non-celeb just because, well, this baby is so very, very cute... and she nails the Jack evil grin!