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Mark Ruffalo HIGHlariously Proves He's Jimmy Fallon's BFF By Playing The Best Friends Challenge — Watch!

| Filed under: TV NewsJimmy FallonMark RuffaloHIGHlariousLate Night TV

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Mark Ruffalo and Robert Downey Jr. might be #ScienceBros but the actor's BEST friend is clearly Jimmy Fallon!

The 48-year-old stopped by The Tonight Show on Wednesday night and had a bit of fun with the late night host as the two tried to prove they were BFFs for National Best Friends Day by playing the Best Friends Challenge!

Video: Jimmy Proves Daniel Radcliffe Looks Like 'Stern Old Ladies'!

During the game — which is basically the Newlywed Game for besties — the celebs do their best to guess each other's favorite sandwhich, worst fear, and of course their favorite superhero — and the results were HIGHlarious!

Ch-ch-check out the fun new late night game (below) and let us know if you think your best friend could answer the same questions!

Make sure to watch The Tonight Show weeknights at 11:35 p.m. EST on NBC!

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