Will Ferrell and Chad Smith engage in drum-off on Jimmy Fallon's Tonight Show

Drummer and actor's joke feud reaches a climax

Dressed identically, the pair were hard to tell apart (YouTube)

Uncanny lookalikes Will Ferrell and Chad Smith squared off on The Tonight Show last night, discussing their essentially being the same person with Jimmy Fallon before taking part in a drum battle.

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The facial similarity between the two has always been clear, but seeing the pair both dressed in Chad's clothes really hammered it home.

The Red Hot Chili Peppers drummer is used to being mistaken for the actor, previously telling 3News: "People come up to me in airports and they’re asking for my autograph, not because I’m the drummer for the Chili Peppers – they really think I’m Will Ferrell. And I’m nice to these people. (I say) ‘No, I’m not.’ But they’re like, ‘I loved you in Old School. You’re so funny.’"

He also told the story of their first encounter:

"There’s a buffet line and I walk up and I’m getting my second shrimp skewer. There’s a guy next to me doing the same thing and then Will Ferrell is next to him and so I kind of glance over. Right at the time I’m turning to leave the table and start walking back, the guy between us splits and both Will and I turn kind of at the same time. It was classic.

"He eyeballs me up and down, and he goes, ‘You’re very handsome’ and walks away."

Unsurprisingly Smith dominated the drum battle, but Ferrell made amends with some furious cow bell as he was joined by the rest of RHCP who burst onto the stage for a surprise performance.