I think they call it 'Thinning the Herd'
It never ceases to amaze me what people will get up to for a little bit of fame. For example, rodeo bull poker.
Now you would imagine that I would be the first person to agree with the concept Darwinism, and I wholeheartedly support the Darwin Awards (no relation, sadly), however this kind of carry on reflects badly on us as a species.
What will the Martians say? With the ubiquity of multifarious life-threatening situations surrounding the modern human, we still go out of our way to do something colossally stupid for kicks.
This particular event is a clear cut argument against the nanny state and the current trend towards mollycoddling in general. Middle class Americans have become so used to hand-holding throughout their lives, that genuine danger can become invisible to them.
If you watch the clip, you'll see that the elderly lady who volunteers is under the impression that this is a completely safe activity in which to engage.