Wanna see Harley turn the tables on Mr. J?
In the Batman Adventures: My Boyfriend's back, the Joker's been subjected to all kinds of "therapy" at good ol' Arkham and it's pretty much eviscerated him from his naturally homicidal tendencies. So he's super lovey-dovey to Harley -- and guess what? She HATES it. (Still noob-ish on the tags issue ...sorry 'bout that and hoping the cut works....)
And so she figures trying to kill him will bring him back to his ol' ways...