We all have that one friend who always seems to cross the line, even when you specifically tell them not to cross the line.
The one friend who seemingly can't help themselves. The friend that will pants you while on a field trip. The friend who raid the mini-bar and think they can fill the booze up with water and get away with it. The friend who keeps making you laugh in class even after you already got two warnings from your teacher.
Or the friend who completely takes advantage of your blind trust in them.