Convince me to ride roller coasters
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>> "Fuel peer pressure: everyone's doing it"
I'd personally add a caveat here though. You don't want to over do this. If too many people are trying to convince you to do something (Apple evangelists, git lovers, tweetaholics), quite a few people just close off and assume these people are madmen with an agenda.
Can end up polarizing people.
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.
But put me on a 12/12 roof, and I can't stop shaking.