Teacher:"Michael, if you were on a date having dinner with a nice young lady, how would you tell her that you have to go to the bathroom?"
Michael: 'Just a minute I have to go pee.'
Teacher: 'That would be rude and impolite. What about you Sherman, how would you say it?'
Sherman: 'I am sorry, but I really need to go to the bathroom. I'll be right back.'
Teacher:'That's better, but it's still not very nice to say the word bathroom at the dinner table. And you, little Johnny, can you use your brain for once and show us your good manners?'
Johnny: 'I would say: Darling, may I please be excused for a moment? I have to shake hands with a very dear friend of mine, whom I hope to introduce to you after dinner.'

I've loved little Johnny jokes for over fifty years.
Cal