Oh, yeah I'm sorry I did.
I think, I guess you do too, that it's so much more evil to start out with a man who just thinks the idea of killing is hilarious, rather than a failed comedian. If you have a failed comedian, I think that makes people think that they SHOULD laugh at least a little bit, and then jokes are gonna be forced out of the plot and stuff. I think the funniest things that help prove how insane The Joker is, are the stuff in the cartoon for the most part, such as:
Joker pulls out a gun, the guy says "hey man, I'm just kidding". He shoots. Its a "BANG" flag gun. He laughs, "So am I". After the man calms down, he fires the gun again, and the flag goes into the man's neck. "Whoops, no I wasn't."
Not only is that hilarious dark comedy, but it also shows that this man is not doing these jokes for a laugh for anybody but himself, and he's so out of it that he finds murder to be the funniest thing of all.