ReefHound:I understand your point but, wow, you don't really do that, do you? That's just not right to trick people into doing something they didn't think they wanted to do, even if their feelings do change. It has to be their choice. If something were to go wrong, you'd be toast in court. Maybe even criminally negligent.
Now I kinda' tossed out the readers digest, abridged, poetic Justice version to show a point. In my response, I said, don't ever take anyone past their comfort level, and with this person who said they really didn't feel they wanted to go past 40 feet because it would be cold and scary. (As it was in the Lake where I did this persons check out dives... and now we're in Cayman). I told them I was going to be their buddy - we'd make a nice slow ascent, and at any time, they give me the up sign and we'll make a nice slow ascent together. As we are slowly working down, I'm repeatedly asking for an ok sign - and getting one back - they are doing great - comfortable, happy, having fun. We slowly circle onto a big sandy patch - get another ok - then show them that they are past their mythical 40' and she started laughing in the reg, and pointed down the reef at a turtle swimming by - which we headed toward.
If that experience could be declared criminally negligent, then someone throw me in Jail as I would repeat it with any diver I'm training - it was a great experience for my student, and for me with safety always my biggest concern - but enjoyment of scuba has to be close behind. If everyone wanted to be safe... they'd stay on the boat.