My most recent discovery almost 20 years later is short stalls.  I was attending a play at a high school and when I went in the restroom I noticed right away that the stalls were short cubicles.  They had doors but your head stuck out the top, which means any one barging in can look right down at you.  I turned around and left.

I know the reasoning behind these types of violations; drugs, smoking, sex, etc.  But, logically, only a handful of students are going to break these rules and if they plan on doing it you can bet they will just find somewhere else to go.  My former classmates’ solution to this was the woods, the drum room, or the dark room.  Where there’s a will, there’s a way.