lol, the only thing that comes to mind (maybe cause I'm a Finn and like my safe space) is when you are in a public bathroom using the let's say the 4th out of 5 urinals and you notice someone else come in and goes directly for your neighbor urinals even though the others were empty.
Don't be that guy. :P
re-phrasing:
Bad Public Toilet Etiquette: Don't use the urinals next to another urinator when other ones are free.