How would YOU say it?

"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 rest room?" the teacher asked.

"Just a minute, I have to go pee", he said.

The teacher replied, "That would be rude and impolite. What about you, Paul, how would you say it?"

"I am sorry, but I really need to go to the bathroom, I'll be right back."

The teacher responded, "That's better, but it's still not very mannerly to say the word 'bathroom; at the table"

"And you Johnny, are you able to use your intelligence for once and show us your good manners?"

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 you'll get to meet after dinner."