What jokes do you laugh at before you tell them?

A man went to a bar to have a dull drink. He just drank a bottle, and a sister came over to strike up a conversation. Said that if I asked her to drink, she would promise me anything, so I asked her to drink with me. After drinking, my sister pulled the suspender of her underwear and shyly asked me, "Say, handsome boy, whatever you want me to do." I smiled and said, "Then please pay for the drinks!" I was so witty that I saved dozens of dollars.