Funny Dirty Joke

A boy and his mom go to a nude beach then they see men with big dicks. He asks his mom why they have big dicks and she said the bigger they are the dumber they are. Then they see women with big boobs and he asks why are their boobs so big and the mom responds the bigger they are the dumber they are. So the boy sees his dad and goes back to his mom and tells her "I saw daddy talking to a very dumb girl and he was getting dumber by the second. KICKASS