There was one day, after a curry the night before, while waiting between trains I felt the dreadful churning in my stomach that said you have exactly thirty seconds to get to a toilet or else it's going all over your pants.
So I sprinted to the toilets and the only cubicle left had no door, presumably broken by vandals given the amount of graffiti in it. It was an emergency, there was no time for debate so I went straight for it. Thankfully no one seen me but it was a pretty dire situation to be in at the time!