Have you ever taken a leap into the dark?

Did you ever take a huge risk, knowing it would hurt someone? Perhaps it was the risk of death or the risk of being badly hurt or the risk of badly hurting others. Whatever the risk, you knew that negative consequences were virtually certain, but you still leaped into the dark.

What were the events leading up to that leap? What did you hope to accomplish? What possible consequence made you willing to take that leap? Did you achieve your goal? Was anyone hurt when you did that?