I have done so.....when I was in a public toilets....I thought I had locked the door behind me....but the lock was faulty......yep you guessed it, someone behind me opened the door and I had just dropped my pants................I was SOOOOOOOO embarrassed......luckily I neer had to meet the same person ever again.............I made sure I walked out the loo with my head down and not make eye contact. lol.