Mike replies "Wait a minute, I'm going for a pee"
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 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. "
The teacher passed out