The blonde inmates in a prison had a joke book they all had memorized. The way they recited jokes was by the number of the joke. Some inmate would call out a number from one to one hundred and all would laugh. A new blonde in the prison, after studying the book, said she wanted to tell a joke. They said, "Okay, shoot!" She said, "Number 10," but nobody laughed. She said "This is funny. What's wrong; why aren't you laughing?" An inmate nearby said, "Some can tell them and some can't."