Unlikely allies
Write some dialogue for Jason Todd reacting to meeting an alternate version of the Joker who claims to be a superhero.
How would current main continuity Jason Todd react to meeting the Jokester, the old good guy version of the Joker, and what do you think would have to happen to convince the two unlikely allies to work together in the absence of other superheroes?
I may think the scene in Countdown to Final Crisis #31, where the Crime Society gangs up on them, and Jason thinks they are in so much trouble that he just gives up and says, "someone, just hit me with a crowbar now," and then the Earth 3 Jok(st)er shouts, "that's a cue if I ever heard one," and comes in with a trick mallet and basically saves everyone's bacon, is one of the funniest scenes ever printed in a comic book.
Alas, they rebooted Jason Todd, and the whole DC universe now, so that story is no longer part of the "official" continuity. Perhaps it was at least cute, though.
I might kind of like to read an Elseworld comic where the two team up...