https://www.superherohype.com/movies/534797-james-gunn-makes-bet-with-fan-over-superman-legacy
In a Twitter conversation, a user called @AppsConnor told Gunn that if Batman and Superman sit across from each other at a diner while chatting in a movie, they would eat one shoe. If the superheroes discuss how they could solve one another’s problems, the user would eat another shoe. Finally, if Batman interrupts Superman by saying “because I’m Batman,” they will eat a third shoe.
James Gunn replied to the user’s conditions, saying, “Ok. Good to know. Back to you in a few (years).”