[watching a green Homer being taken down by the cops]
Stan Lee: He can't be the Hulk... I'M the Hulk!

[rips his shirt open, growls, and tries to change into the Hulk]
Comic Book Guy: Oh, please. You couldn't even change into Bill Bixby.

Stan Lee: Come on, dammit, change!
[continues to growl and signs]

Stan Lee: Ah, forget it.
[goes back to growling]

Stan Lee: I really did it once.

Comic Book Guy: Yes, yes. I just wish you had the power to leave my store.

[they go back inside and Stan Lee starts growling again]
Comic Book Guy: Almost had it there.