During the course and at the end I explain all the things they are going to see once they start going on dive holidays/trips things that hopefully they will see and think wow those divers are asking for trouble or I think I do not want to be buddied up with this person or I wouldn't trust this Instructor/divemaster/dive leader with a dead cat let alone a group of divers. I explain that a lot of things they have been taught they will never see being implemented by other divers.
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I like your approach, especially this REALITY part.