I have one:
This joke takes place in the south. There are two little black boys going from one small town to another small town. They are riding one bike with one of the boys on the handle bars. The bike pops a flat and so they have to decide if they should go forward or back. Since they are about half way they decide to press on. They tell stories and jokes along the way.
A short time later along side of them pulls a semi truck. The driver says in a thick southern accent "Hey! You boys goin ta the next town?"
They looked at each other a bit confused and then told the driver that they were.
"Well, I'm haulin a load of bowlin balls, but you guys can put 'cher bike back there an get back there yer selves and I'll carry ya over ta the next town."
So they get in the back. This guy then starts driving like a maniac. He gets pulled over. Two cops get out. One is really angry with this guy. He takes protecting the highway seriously. So he starts yelling at him. His partner says he's going to check the load. Not a minute goes by and the cop returns from the back of the truck looking like he's seen the most horrible thing ever. He interupts his partner and tells him to let the guy go. He insists.
"You're lucky my partner is feelin real lucky mister. You take whatever the hell it is you're haulin and you get the hell off my road and you better not let me catch you bein a danger ta other people."
The driver pulls of carefully. Cop says to the other cop, "Okay, now you better tell me why we let that guy go."
Cop swallows hard and says, "Look, he was haulin a load of negro eggs. Two of em already dun hatched and one stole a bike."