I used to go to a water park once a summer with my family. They had a lot of waterslides and go karts, but their oldest attraction was a zipline that lacked any safety features. You'd just sit on the edge of the platform and hold on until you hit the end when you'd get flung into the pool below you. My first experience on the zipline, the five kids in front of me in line fell off the zipline the moment they left the edge. Sitting at the back of the line, you couldn't see that they were landing somewhat safely in a pool. Watching one after another fall to an uncertain crash landing was really exciting but filled me with a minor amount of dread. When I got to the front of the line and took a seat on the edge, I noticed that the pool extended well below me, and when the attendant handed me the zipline I handed it back to him and just jumped. I'm pretty sure this is exactly the kind of thing Helen Keller was talking about when she said, "Life is either a daring adventure or nothing."