This particular story came from my friend who teaches kindergarten in Virginia.
She took her class to another school for a field trip to see their "pen pals." After the gathering, she had the class use the bathroom before they went home. Most of the children also took advantage of the water fountain outside the restrooms before boarding the bus to go across town.
Miss Jones: "Johnny, did you want to get a drink here at the fountain before we get on the bus?"
Johnny, "Naw.....I got a drink from that one in there!" And with that, he pointed to the boys bathroom.