My first time kayaking my "friend" took me on a III+ creek at high water. A trusting fool I was. In the fourth rapid I flipped and pinned upside down on a rock. Long story short, it sucked,bad! The whole experience may have last 30 secs but the effects where long lasting.I still boat but psychologically I'm plagued and struggle with that day every time I'm upside down. I have been around rivers all my life and taken some shitty swims rafting but that day something changed. It would have happened eventually but I think with gradually steps , I could have drank my beer and that would have been the end of it. For what it's worth, I'm a big fan of baby steps. Most people won't quit boating out of boredom, they'll find new people to boat with. Scare the shit out of them and they're probably done.