"I have never understood the active support for the practice -"

Unfortunately, Jim, the excuse, "I've got a poor memory" is often taken at face value - at least it is at the singaround that I occasionally attend (it has to be said, less and less regularly these days). I'm afraid that, if I was the singaround organiser, I would probably make myself very unpopular by asking any crib sheet using participants to bring a 'doctor's note' to the next session!