Funny a few years ago whilst having a new kitchen fitted, I went to the bathroom and closed the door (I live alone so don't usually need to) I heard the door chime go and new the chap was probably going for dinner/lunch. Tried to open the door but heard something snap inside it... no way out, nothing on me to undo the screws, fortunately the chap came back about ten mins later, getting gear from van. He took the door handle off from the out side. I felt a bit of an idiot but not my fault.