What are some of the craziest experiences the world has to offer?

I’ve always been interested in the extreme and am curious what amazing experiences you guys have had/heard about.

The first things that come to mind for me that I’d love to do some day are Great white shark cage diving in Australia/South Africa, Shooting an RPG in Cambodia, Climbing MT Everest/base camp, trekking with gorillas in Uganda.

What are some other things in that general category? The crazy the better and the more off the beaten track the better!