they do not manage to do it. Then John says:
J: Mary I will go to the dentist to help me.
M: If you think this is the best idea then go.
The dentist manages to pull the hair out and ask John:
D: John you did the “nasty” with Mary, didn’t you?
J: Yes doc how did you know, from the hair in my teeth?
D: No John, you have shit on your chin.