So I can’t find mention of this one on this thread, but it is one I have run into before and almost got me last night…

Bathroom door has a pop-style lock; push the button in to lock the door. Doorstop is a knob mounted on the wall corresponding to *exactly* where the lock knob is. Thus, if you open the door with anything but the utmost care, the doorstop hits the lock knob and pushes it in. Then when you go to leave, the door locks behind you and you have to get some object to, if you are lucky, pop the lock open from outside, usually in the middle of the night.