2) A dive I did in Mexico many years ago. The dive parameters were "45 min", "dive within NDL's" and "don't forget to do a safety stop".
There were 3 or 4 buddy teams, which mostly consisted of inexperienced divers. The DM went overboard and most of the boat went overboard with her and started swimming where-ever her flippers went. The DM decided to swim at about 10m through the dive-site.
I, and my buddy,... however... decided to decend to 30m (the hard-bottom) to look for nudibranches on the sandy bottom. We were fully aware of the parameters of 45 min, no-deco and and safety-stop and followed those instructions to the letter.
The DM, however, didn't understand her own briefing and started getting spastic as soon as we got deeper than about 15 metres. She whistled us back 3 or 4 times because we went deeper than she did and started inspecting our SPG's and giving us increasingly "stern" warnings to maintain depth.
We exited the dive somewhat..... er... irritated... because the DM wouldn't accept us doing anything else besides following around behind her flippers (which is the only thing most of the divers on that dive saw).