Would this have even been necessary if he'd caught it?

Don't bother. You'll only die tired.

Wow. It sounds like this video is miserable to watch, so will someone break it down for me? Did they catch anyone? (I'm doubtful.) Were the rims returned? (I should expect not!)

I'm inclined to fall in the middle here.
Smoked a pack a day for 20 years and got lung cancer? That's a victim that took a risk and lost. BUT...
It's impossible to eliminate cancer risk entirely. Cancer is semi-random with an off-on trigger. Risk is cumulative, and while incidence can be correlated with risk across populations, incidence is not directly correlated with risk for a given individual. Some people will tan for years and never experience the specific set of mutations and biologic failsafe failures that results in melanoma, while others will trigger that specific set of conditions rapidly, even when the starting biologic conditions\predispositions are the same.
So, yes, I believe some people "get credit" for their cancer (or other illnesses) because of their behaviors, but others are just unlucky.
Even setting aside the randomness of incidence, we're constantly bombarded with a significant cancer risk factor in the form of ionizing radiation, and not just from avoidable sources like deciding to live in a brick house or eating bananas.
I also disagree with the idea that more money wouldn't help eliminate (contrast with "cure") cancer, because many organizations funding cancer research are looking at identifying risk factors, which leads to opportunities for educating populations about avoiding those risk factors. Cervical cancer can be caused by HPV? Get your kids vaccinated, don't have unprotected sex, etc. Lung cancer can be caused by smoking? Stop smoking! It isn't just about finding a magic medication to reverse cellular mutations or target mutated cells, although that would be fantastic.

George Carlin said "Fuck Tiger Woods" and lo, many women took that advice to heart.

>> ^Zaibach:
Not what I expected.
Yeah, among the other candidates for "What could go wrong" is successfully getting through the ice, but not being able to find your way back out.

I've been to the Cosmos Mystery Spot up near Rapid City. Just because I know how it works doesn't mean it wasn't still a hoot.

>> ^messenger:

My best guess: water would shoot out the top and bottom, and soon after, the sides of the bottle would be sucked in from the momentum of the water leaving and nothing replacing it.>> ^grahamslam:
So what would happen if he exploded it without the cap on it?

Exactly like we see in their "self portrait" burst. The top flies off and the sides of the bottle collapse inward.

My initial suspicion was the same as the host's - that the bottle was rocketing up and the cap was "overrun" by the rest of the bottle. That doesn't hold up to scrutiny since the cap "shrinks" back rather than staying still.

In their first explosion, the cap actually explodes very quickly after the burst. That seems relevant. I'm not sure how.

My second thought is along the "vacuum\low pressure" line of thinking. The entire bottle is pressurized in the instant of the explosion, and then ruptures at the bottom, so now the bottom of the bottle is lower pressure as water is rushing out, pulling the cap end down. Bernoulli principle, perhaps?
I imagine a bottle full of water, but it has no bottom. The water is rapidly and forcibly evacuated. The logical thing is for the cap to be crumpled downward.

Ooh, wait. Could this have something to do with the gas at the top of the bottle vs the liquid? I'm having flashbacks to the Mythbusters episode about the sinking car, and how the pressure of the water inside the car was lower than the outside as long as significant amount of air was left in the vehicle, so even though the water was up past the inside of the car door, it still couldn't be pushed open until the rest of the car had equalized. This seems relevant to me as well, though I'm not sure how, exactly.

Wait - did he show all this and then somewhat defuse the utility of it at the end by saying it doesn't work on diet beverages?

I've seen lightning strike trees, and that's what it looks like.