I never had a problem with roller coasters, even the ones that invert, even the ones that invert and the harness feels loose and you fall of your seat and know

I never had a problem with roller coasters, even the ones that invert, even the ones that invert and the harness feels loose and you fall of your seat and know there's only a thin buckle holding you in place. However swimming I had a problem with; I love to swim, but if anyone tries to dunk me I panic and I have the same reaction at 21 as I did when I was 7, but now I'm a 300lb man used to lifting 60 kilos while working so my reaction isn't usually pretty. I do have a strong sense of self-preservation that I've always attributed to actually knowing the risks of the things I'm doing. You'll never catch me parachuting, because I know what the physics of a parachute failure mean.