I went to school with a guy who once burped so loudly that it created a black hole. He wasn't one to panic and he was probably the smartest guy in the class, so he quickly opened his mouth and swallowed it straight back down. It's stayed there ever since. The real tragedy is that he can never drink a fizzy drink again for fear of destroying all creation. No Coke, no Pepsi, no Tango, not even beer. He says it doesn't bother him, but I know it does.