Just because you've worked closely with someone in a movie does not mean that you know everything about them .
In the clip above from Jimmy Kimmel Live! Five of Avengers: Infinity War play a guessing game with each other. Basically, Kimmel reads out a fact about one of them, and everyone has to write down their assumptions to whom the fact refers.
There is an embarrassing story about flashing a stranger in an airport bathroom, a dirty tale of lost virginity on the second hole of a golf course, and a whole lot of Dave Bautista, who has guessed Mark Ruffalo for pretty much every turn.