"Little Johnny's finger" joke
One day little Johnny saw a girl at school he told her to come to his house after school. But she said I don't know if that's such a good idea. Johnny said o come on nothing can happen.
When they got there he said "lets go to my room" she then said I don't know if that's a good idea. He said "I want to show you something" she went up and he said get in my bed nude she said "I don't think that's such a good idea" he said "oh come on I wont do anything."
He said "can I put my finger in your belly button" she didn't question because she knew he would get his way. Next thing happened and she said "that's not my belly button" he said "I know and that's not my finger."
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