Best friends are supposed to be the people we know the best — unless we’re being quizzed about them on national television.

Mark Ruffalo and Jimmy Fallon played the “Best Friends Challenge” on Wednesday’s episode of The Tonight Show, and, aside from Fallon’s favorite superhero (The Hulk), the two didn’t exactly nail each other’s personal trivia.

The most fascinating moment, perhaps, was when the two each guessed Fallon’s best physical attribute. Ruffalo seemed torn between “eyes” and “ass” — a sweet compliment, to be sure.

Best friends always know just what to say.

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Mark Ruffalo seems a little torn about Jimmy Fallon’s best physical attribute