Last week, Will Ferrell told Rolling Stone that his rivalry with Red Hot Chili Peppers drummer Chad Smith “could become the beginning of a rivalry that will go on until the end of time.” The rivalry came to a hilarious and loud clash on The Tonight Show on Thursday night.

Fallon asked, “Do you remember where you were when you heard [about this imposter]?” And one of the Chad Smith’s responded,

Yeah. I was jammin’. I was jammin’ with the Chili Peppers, with my guys. At our jamhouse. I’m like, ‘Flea, this is bull. I’m tired of not getting enough respect as Chad Smith. I’ll be honest, I’m a little high right now.”

The famous doppelgangers of each other finally duel with an amazing drum-off to determine the real Chad Smith.