Timothée Chalamet Helps Fallon Channel His Inner Jimothée Fallomet: ‘Are You Sure You Want to Do This?’ | Video

Timotheé Chalamet surprised Jimmy Fallon by giving him a hand in the “Tonight Show” host’s attempt to channel his alter ego Jimotheé Fallomet.

Before the show kicked off Wednesday night, Fallon went full-on Chalamet by coming onto the stage sporting a thin, Chalamet-like mustache while holding a ping pong paddle, a getup that nods to the actor’s upcoming film “Marty Supreme,” which is loosely based on legendary table tennis player Marty Reisman.

Just as he was about to go into his monologue, Chalamet popped in and interrupted the host, telling him that he feels like Fallon is “mocking” him. The actor explained that if the comedian truly wants to be him,…