Bubbles...

My son ,Christian, had an unopened water bottle and was watching the bubble go from the bottom to the top as he rotated it. "Mom, why does the bubble always rise to the top?", I quickly asked him, "When you fart in the tub does the bubbles stay at the bottom or come to the top?", "MOM!!!!!!!!" he said and I said "Well?". He said, "Okay Mom." I never saw is face so red before, we both got a great laugh from it! Thought I would share this one.