Buddy, I'm here for you. Here are 2 that my 11 year old son told me:

How do you get a tissue to dance? You put a little boogie in it. Why didn't the shark eat the clown fish? Because it tasted funny.

Now here's one from me:

A poor man living in a very rural area decided his son had grown to be old enough to "become a man," so to speak, and sent him into town to buy himself a woman. But, being as poor as they were, all he could send his son with was a duck for payment. He told his son where to go, and what to do, and sent him off.

So the son steps into the [house of ill repute] with a duck in hand, and tells the madame he'd like a girl for the evening but all he has to pay her with is a duck. The madame, taking pity on the poor young man, tells him to go to room #2. He goes to room #2, pays the girl with the duck, and proceeds to enjoy his first sexual experience.

Well the boy is a natural. The girl he was with was so impressed with his sexual prowess, she asks if they can do it again. She even offers to give him the duck back. So, they go at it again.

Flush-faced with happy exhaustion, the young man collects his duck, thanks the ladies and makes his way home. On the way home, the duck got away from him, and out into the street where it was promptly killed by a passing big rig truck. The driver got out and apologized profusely for killing his duck, and offered him $20 to make up for it.

So when the boy got home, his dad asked him - "Well son, how did all that work out?" The boy said, "well dad, I got a fuck for a duck, a duck for a fuck, and twenty bucks because a truck fucked up my duck."