I wish Batman would fuck with the Joker more. I know he can't. Scratch, I know an important piece of their core dynamic is that he is above it, which opens the way to great contrasts when other characters (ie icon Terry Bats) do. But come on, it would be so easy. It would be free.

During a teamup in Gotham, Bats could dreamily remark that he likes Superman because he makes him laugh. What options does the clownfucker have now? Try to jealously kill fucking Superman or simply dive backwards into the Hudson River. The whole thing would take ten seconds of work, and I don't think there'd be collateral damage. Superman's already there.