A sketch I came up with.
Int. School Hall
It is afternoon assembly at King George VI school. Mr Jones, the headmaster, is on the stage with young Johnny Carmichael.
Mr Jones: Now everybody, I've promised Johnny that he can end the assembly for us with stand up comedy he's been working on. I'm sure it'll be very funny, so Johnny, take it away.
Mr Jones goes and sits down at the back of the stage and Johnny moves towards the edge of the stage and takes a mic from the mic stand
Johnny: An amnesiac comes into a bar. He asks, "Do I come here often?"
There is silence from the assembled children, but Mr Jones gives a little chortle.
Mr Jones: Very funny, very funny.
Johnny thinks for a second.
Johnny: Tough crowd, hmmmm. I've got one here you'll like. Don't you hate it when your mothers on her period....
Mr Jones stands up and looks concerned
Mr Jones: Uh Johnny, I don't think thats appropiate.
Johnny: (Ignoring Mr Jones) Don't you hate it when your mothers on her period? She moans, she shouts and...
Mr Jones runs to the front of the stage and tries to grab the mic off Johnny. Johnny runs to the other side of the stage.
Johnny: She moans, she shouts and no matter how much mouthwash you use, you just can't get rid of the taste of her blood.
There is utter silence in the assembly hall. After a second or two of silence we hear a young girl in the front row start crying.