Adrenaline is what you get when your heart starts beating really fast. Your hands get sweaty. Your really scared. I got adrenaline my first time I jumped off the ok falls bridge. I was only with one friend nobody else was there and if someone came we would just climb down the latter and go in to the water. When they would leave we would keep trying. At first it will makes you really scared but then after you do it you dont get why you got adrenaline. Its worth it after you do it! Some times i still get a little adrenaline when i jumps off. Its still fun when you are doing it!