Robert Downey Jr. proved that he is incredibly in touch with his emotions during an appearance on The Tonight Show Starring Jimmy Fallon on Monday. The two played a game in which they had to alter their conversation based on a given emotional cue when they heard a bell. Robert, who described himself as an "emotional chameleon," prepared himself by taking a few deep breaths before they began, prompting Jimmy to say, "You're getting into character . . . as you." Watch the hilarious clip above, then check out Jimmy singing karaoke with Chris Pratt.