What's the major difference between Batman and Spider-Man? Michael Keaton knows the answer: tears.

Appearing on "The Tonight Show with Jimmy Fallon," the former Dark Knight shared a story about watching a scene from one of the "Amazing Spider-Man" films featuring Andrew Garfield and Keaton's "Birdman" co-star Emma Stone.

Explaining that he walked into a store where the movie was playing, holding the store employee's attention, Keaton recounted his interaction. "I go, 'Is he cryin'?' [Laughs] The guy goes, 'Yeah.' And I just wait a little bit -- you're gonna bleep this out -- and I go, 'Pussy,'" the actor recalled, giggling along with Fallon and the audience. "And I wait. And he kinda does this, he kinda looks at me and he's locked in, and I go, 'Batman'd never cry.'"