I once stood in a line to ride one of those carnival things that spins around and round until the floor drops away and nothing but centrifugal force is holding you against the wall. I got to the front of the line and couldn't do it. I cried like a kid (I was probably like 9) and then my mom came and got me and let my dad go on it by himself.

In short, I'm a pussy.

But I love whitewater rafting, driving way too fast, riding on the back of a motorcycle, and I've been known to take substances that aren't very good for me.

So, um. I don't know. Risk gene? I don't have it. Suicidal gene? Yup. That one I know. Some people's threshold is just higher than other's.