I have a lot of favourite clash quotes. Long list incoming.
Aquaman: What makes you think you'll win?
Superman: I'm Superman!
Green Arrow: You're insane.
Superman (Regime): I'm not the one fighting Superman!
Killer Frost: How about some frostbite?
Green Arrow: I got something you can bite.
Sinestro: You fight with a toy.
Green Arrow: You fight with jewellery!
Superman (Regime): Just another criminal.
Green Arrow: Just another politician.
Raven: I'm in no mood, Victor!
Cyborg: Too much Trigon for breakfast?
Sinestro: Human scum.
Green Lantern: Evil AND racist!
Lex Luthor: You look like a chicken.
Hawkgirl: And you look like an egg.
Green Lantern: You know how this ends!
Hawkgirl: En-light-en me./Nice ring. I have a mace.
Batman: Psychopaths like you-
Harley Quinn: Blah blah blah!
Nightwing: This is the end!
Harley Quinn: ...of your face!
Catwoman: Have you no self respect?
Harley Quinn: Says the girl in the kitty suit!
Green Arrow: Slow, stupid and ugly.
Solomon Grundy: Grundy not slow!
Wonder Woman: You embody the worst in men!
Lex Luthor: You ain't seen nothing yet.
Batman: Taking you down, Selena.
Catwoman: Can't wait!
Aquaman: You're not invincible!
Ares: Actually, I am.
Green Lantern: (vs. anyone with nice hair) Nice freakin' hair!
Shazam: (vs. Black Adam) Wow, even your hair is evil!
The Joker: (vs. Bane) Is it Bane or Bané?
The Joker: (running with a crowbar) NYAAAAAAAAGH!!