Racist is a no-no, not just because forum rules won't allow it but because I have rather strong feelings on the matter myself (anti-french or anti-american or anti-british or whatever is fine, but skin colour is not a funny subject considering History). Sexist I'd rather you didn't, but if they're funny enough I'll allow. Blonde/tart jokes are fine, of course, but ones targeting all of womankind may be deleted without warning if they're too offensive.
Some from moi...
2 peanuts walked into a bar.
One was a-salted.
These 2 show how important punctuation is...
A panda walks into a bar. He orders a meal, eats it, pulls a gun on the bartender, shoots (narrowly missing him), and then legs it. When captured by police later the panda defends his actions by pulling out a nature guidebook to show that his behaviour is normal. "Look," he says. "Panda: Eats, shoots, and leaves."
An English class was asked to punctuate the sentence "A woman without her man is nothing." All the men in the class opted for "A woman, without her man, is nothing". All the women in the class went for "A woman; without her, man is nothing." Punctuation ftw.