Jimmy Fallon has asked plenty of celebrities to imitate each other on The Tonight Show lately — remember Christina Aguilera nailing her Britney Spears impression or Ariana Grande convincing you she's Celine Dion? Finally, someone has turned the tables on the host. During Tuesday night's episode, Louis C.K. shared his impression of Jimmy, based on an audition Jimmy gave in the '90s. It was so good that even Jimmy was laughing! Watch the hilarious moment in the clip above, and if you're loving all the impression fun, treat yourself to Kevin Spacey taking on famous voices.