I'm tied up between Demon Drop and Power Tower's turbo drop side. I guess I can say that any freefall ride scares the crap out of me! It's not really the ride itself that scares me, it's the anticipation of the drop while you're sitiing at the top of the tower, especially with Power Tower because the amount of time you wait always changes.
Speaking of Ripcord, while at Cedar Point two years ago, a friend and I were going to ride Ripcord but my uncle wouldn't let us do it until my friend wrote and signed a contract releasing my uncle from being liable if we were to die. My friend wrote up a contract on the back of a napkin from the Boathouse, signed it, and gave it to my uncle. When we got in line, a storm passed over us and we didn't get to ride (and I was going to pull the cord too!). I'm pretty sure if we rode, that would be number one on my list of scary rides!