That is insane. I would never ever do that. Not even for 100 billion dollars. If I were out there, I would have a heart attack, and there would be a big mess in my pants. I can't believe they did pull-ups and were just hanging like that. Imagine. One slip and its over.
When I first started my job I was 19, didn't have a care in the world and thought I was a bad-ass, thought it was impressive to not be tied off. Now I have a wife and child, things are looked at in a WHOLE different perspective, really changed my life and how I look at a lot of things.
Then there were the times we would climb the cell phone towers drunk and stoned...but that's getting a bit off topic.