Going To The Toilet_英语笑话

during a good manners and etiquette class being held for young children, the teacher says to her students:
"if you were courting a well educated young girl from a prominent family and during a dinner for two you needed to go to the toilet, what would you say to her?"
mike replies: "wait a minute, i'm going for a piss."
the teacher says: "that would be very rude and improper on your part."
charlie replies: "i'm sorry i need to go to the toilet, i'll be back in a minute."
the teacher says: "that's much better but to mention the word ''toilet'' during a meal, is unpleasant."
and little johnny says: "my dear, please excuse me for a moment. i have to go shake hands with a personal friend, whom, i hope to be able to introduce to you after dinner. "