I don't know if adrenalin is the right word... but I do like extremes. I worked on dive boats for years and I would do extremely deep, unsafe dives. I'm not sure what drove it. I was also a breath hold diver (free diver) and pushed limits. I'm scared of heights yet I got into multi-pitch climbing. I surfed in stuff way to big for me. It's like I was testing myself somehow... and perhaps I wanted things to wrong in a way. I dunno... I have a pretty negative outlook right now.