I guess I have a dark sense of humor. Something about people showing off and totally failing. It didn't look like any permanent damage was done.
You apparently had more information about that video than we did. You see someone showing off, but I saw someone deliberately kicking the shit out of someone. Failing by falling on your own ass is one thing, but failing and hurting someone else through careless negligence is a selfish disregard for other people. I can't see that as amusing, no matter which way you spin it.
As for "no permanent damage" -- wtf? The video cuts off with the woman clutching her head in agony. Yes, she's still alive and breathing, but the kind of kick she received could very well have caused a concussion or stretched neck tissue in ways that results in neurological damage akin to whip lash.
Watching that video made me feel sick.