I Cup

The mind of an eight year old boy.  Where to begin?  Our oldest son had some friends over and they seemed to be deep in thought.  One of them said, "Hey Miss Bea, how do you spell I cup?"  I stood with confusion and asked, "What do you mean, I cup?  Is that one word or two?"  The boys began to giggle and said, "It's one word Miss Bea.  How do you spell it?"  "Ummmm, I 'c' 'u' 'p'?"  (more giggles)  Can you spell it again Miss Bea?  "I 'C' 'U' 'P'?"  The room erupts into roaring laughter.  "Try one more time Miss Bea!"  Ok, WHAT am I missing here?  "Guys I don't think I cup means anything...I don't understand what you're trying to spell..."  The bravest boy of the bunch explodes saying, "Miss Bea!  You're saying 'I see you pee!"  BwaaHaaHaa!"
Ooooooh the mind of an eight year old boy.