Two things popped into my head.

When I was 11, my family was visiting England. We were watching tennis at wimbledon, when I got seperated. I found my way back to where we were staying (across the city) by myself. I was scared, but kept my wits about me.

The second was about 8 years ago. I checked myself into a mental hospital, when I was feeling suicidal. Sounds easy, but it wasn't.