I know his punchlines suck now but I use to think Eminem was pretty funny, I mean listen to the song As The World Turns off of The Slim Shady LP and try not to laugh. Anyways I think it would be funny if he did a punchline like
I was white so they said I had wack taste
That's why I did all my shows in black face
Something like that, I know I'm not really a lyristist. Also something about taking too much extacy and having sex with trees.