Hey, hey, here's one:
"Why didn't the mexican want his daughter to marry the black guy? He was afraid the children would be too lazy to steal."
The kicker: my black mother taught me that joke, who in turn learned it from her mother, and so on. Where I come from, ironic racism is a finely cultivated art, to be enjoyed by those who are in on the joke, loathed by those who don't, and silenced by those who are irrationally averse to humor. Around these parts, anyone who's so much as suntanned can throw out the casual race joke, and as long as they don't mean it, everyone except for the uptight city-dwelling white folks (no offense to any uptight city-dwelling caucasions who might be reading this; but we do get a lot of those around here) will chuckle at it.
However, my homeland is something of a double-edged sword: if we find out that you are actually rascist, then we'll and mark you for death in a week's time.
So yeah, racism can be funny when done by someone who knows how, but it can be a grevious offense by someone who actually means it.