I C U P works on 88% of people.
Tell someone to spell "Icup."
Answer: It will say, "I see you pee!"
Me: Spell "I cup."
My Friend: I see you pee.
Me: BOII YOU BETTER GIVE MEH SOME PRIVACY IN MY BATH ROOM!!!!
My Friend: Oh hehe O-O
Kalyn: Mrs. Frizzle,
Mrs. Frizzle: Sure.
Kalyn: Can you spell I-C-U-P for me?
Mrs. Frizzle: Shut up, you little fucktard!
Spell "I cup..." "I see you pee!"
"Spell ICUP."