Tina Fey & Jimmy Fallon, <em>The Tonight Show</em> Tina Fey & Jimmy Fallon, The Tonight Show

Tina Fey appeared on The Tonight Show Monday night and played a game called "First Impressions." Jimmy Fallon, inspired by Fey's terrible Robert De Niro impression, devised a game where the former Weekend Update anchors take turns impersonating celebrities with no preparation and trying to guess who it is.

Amy Poehler reveals shocking secrets while playing "Truth or Truth" with Jimmy Fallon

Fey says she's bad at this, but her Sofia Vergara is dead-on. Check it out: