Tea, Pee, What's the Difference?

I was just sitting here, enjoying my lovely mug of tea when some sloshed onto my shirt. I exclaim, "Oh, great! I spilled tea on myself." Which lead to this conversation..

Me: (string of muttered curses)

Mom: "You what?"

Me: "I got tea on myself."

Mom: "Pee? You peed yourself?"

Me: "Tea! I spilled tea on my shirt!"

Mom: "Oooh.. Tea. Tea on yourself. Heh."

Me: "Yes, mom. I've been potty-trained. You were there, remember?"