Yesterday was National Best Friends Day, one of the internet's many, many unofficial holidays, so Mark Ruffalo and Jimmy Fallon celebrated by putting their friendship to the test. On The Tonight Show, Ruffalo and Fallon played a platonic version of The Newlywed Game buy quizzing each other and seeing if their answers matched up. So, how well do the two know each other?
Turns out, not that well! Their answers didn't match up when it came to favorite sandwich or biggest fear but they did get one obvious question right. Find out which one below: