Look at this photo and tell me which drummer is comedian Will Ferrell and which drummer is Chad Smith of the Red Hot Chili Peppers.

Exactly.

The two men finally faced off in a drum-off on Thursday night’s The Tonight Show Starring Jimmy Fallon, all for charity and arranged via Funny or Die (where Ferrell has more than a rooting business interest). This is like a scene from Step Brothers meets Twins.

More cowbell? MORE COWBELL!

Roll the clips!

More behind-the-scenes action at Funny or Die.