T-Rex: Does Batman exist? Oh please. PLEASE. He definitely does. And I can prove it, with -

Narrator: ONTOLOGICAL ARGUMENTS FOR THE EXISTENCE OF BATMAN.

T-Rex: First off: the world's greatest crimefighter is Batman. Imagine him now. Pretty great, right? But if Batman only existed in your mind, then he's COULDN'T be the greatest crimefighter, because the world's greatest crimefighter would exist both in your imagination AND in real life. Therefore, Batman exists in reality too. That's a Q.E.D., which stands for "Quite Excellent Debate (which is now settled, Batman definitely exists)".

Utahraptor: Immanuel Kant would disagree!
T-Rex: I kant believe it!

Utahraptor: Yeah man. He'd argue that existing adds nothing to perfection (in fact, the messy realities of the world may actually HARM it) therefore the world's most perfect crimefighter isn't made more perfect by existing.
T-Rex: No! NO
T-Rex: KANT MUST BE DESTROYED

Off panel: Of course, Kant would then argue Batman's a being of perfect crimefighting OUTSIDE the realm of our experience, thus there IS no way to verify Batman's existence, forever opening the door that he's out there somewhere.
T-Rex: ...KANT MUST BE PROTECTED AT ALL COSTS