I love the adrenaline rush I feel when I have climbed over 100 feet of massive rock, and look down, knowing that your rope and harness are the only things keeping you from falling to your death.  Sometimes I think about my Cheap Rock Climbing Shoes, and start to wonder if they are going to grip as good as they use to.  But, I think the hardest part about rock climbing is the trust issue, because you are putting you life in the hands of a friend, and if the freeze up, screw up, or mess up, then you are going to get seriously hurt, and that is why rock climbing has to be one of the most extreme sports.