Mark Ruffalo and Jimmy Fallon are terrible best friends

Jimmy Fallon and Mark Ruffalo may not know each other on a best friends level, but at least they both love the Hulk. Which is good. Because you don't want to make that dude angry.

In honor of National Best Friends Day, Fallon and Ruffalo played a round of the "Best Friends Challenge" (which some of you know better as the Newlywed Game), where they tried to guess what the other would answer to questions like "what is your greatest fear?" (spoiler: Ruffalo is afraid of drowning in milk but they just let that go for some reason).

The pair is ... not great at the game. But hey, Justin Timberlake wasn't there. We know he and Fallon would have killed it.