One I recently heard:
A guy is having a drink in a very dark bar. He leans over to the big woman next to him and says, "Do you wanna hear a funny blonde joke?" The big woman replies, "Well, before you tell that joke, you should know something. I'm blonde, six feet tall, 210 lb., and I'm a professional triathlete and bodybuilder. The blonde woman sitting next to me is 6'2", weighs 220 lb., and she's an ex-professional wrestler. Next to her is a blonde who's 6'5", weighs 250 lb., and she's a current professional kick boxer. Now, do you still want to tell that blonde joke?" The guy thinks about it a second and says, "No, not if I'm going to have to explain it three times."
If you have any of your own, feel free to contribute them. Nothing too crude mind.