Maybe Michael Keaton was a bit perturbed that the gentleman waiting on him at the cellphone store would rather watch "Spider-Man" than notice that he was standing in front of Batman for heaven's sake!

Whatever the reason, that cellphone cashier may have sparked the next great battle of the superheroes.

While on "The Tonight Show Starring Jimmy Fallon," Keaton recalled that rather than helping fix his shattered screen, the worker looking at Keaton's phone was more enthralled with the movie on the screen across the store, an installment of "Spider-Man," than waiting on his equally super customer.

"Now I'm thinking, 'I've got to get out of here,' " Keaton said. "He's going to put two and two together, and see me, and it's going to be a thing."

However, when it became evident that the cellphone store worker was uninterested in him, Keaton decided to play a little game.

During an emotional scene in that "Spider-Man" film, Peter Parker begins to cry. Keaton's tongue-in-cheek reaction pit the two characters against each other, when he said, "Batman would never cry," amid other unflattering things about Spider-Man's "weakness."