Whether it's the rush of a gambling win, or the rush of skydiving - it all reminds of me of something my dad used to say when we were kids and we'd go to the track to see his horse run (actually owned 1/3). He never bet more than $2 a race - but when asked would say "What is life without a little action?"
Skydiving was probably my biggest adrenaline rush ever. Running of the bulls is something I'd be willing to try some day given the right circumstances.