That's where that came from. It happens to all the Europeans who aren't used to the climate, so they get a wicked diarrhea. It's supposed to be the revenge for the Conquistadors killing the Aztecs. Could be that Montezuma cursed them back then. Maybe he had diarrhea himself and one day when he'd been sitting on the toilet for three hours straight, he screamed out "Why, oh why does this always have to happen to me???"
