This is a spin off from my scuba thread.
I had said I'd go on a trip to Little Cayman next August with a friend. I backed out before I had put a deposit down. Friend wanted me to always buddy with her on the trip (you don't dive alone and always have to have a buddy). She's much more experienced than I am, goes down to 100 ft and swims through rock formations and such. Things I'm either untrained for or uncomfortable with. Your basic certification I have gets you down to 60 ft or so.
When I cancelled the trip, I told her why. My concerns were poo pooed and she's kept at me pretty persistently. Told her trying to convince someone to do more than they want to in a sport where you can die is not a good thing. Several people on a diving forum told me I was being irrational - easy dives, warm, clear water, nothing will happen to you.
Complacency can easily kill you in this sport. My instructor was stunned when I told her what people were telling me.