Something which really annoys me is when you have been talking to someone or hanging out, you go to the bathroom or go home and look in the mirror and see food in your teeth, not blended makeup or some other fashion mess.
Many people seem to be in the frame of mind that telling someone about these things, is making fun of them or embarrasing them. I don't see it that way at all. It may cause some embarrasment but it is better then the feeling of getting home and counting back all the people you saw and interacted with that day.
Do your friend, colleague or random stranger the kind courtesy of telling them and giving them a moment to fix whatever has happened. Just do it subtley. Walk up, whisper in their ear and no one else has to know, they may not have even seen the mishap yet! A sneaky text to someone who always has their phone on them also works well!
So come on girls, stick together! Help a sister out!