Did Jim Carey do the dance in Mask?

Yes, Jim Carrey does the iconic dance in the movie "Mask" (1985). It's a very memorable scene where his character, Stanley Ipkiss, transforms into his "Mask" persona and dances wildly in a diner.

The dance is a mix of energetic, uninhibited movements and improvisational comedy, which was very much in line with Carrey's early comedic style. It's considered one of his most iconic performances, even though it was before he became a major Hollywood star.