I think the majority of the people who film this do it for the attention. There are numerous videos like this, and how many times does a teenage need to see sliding down a railing on a skateboard never works, and he'll probably get "sacked".
The slow motion video of the guy taking a shot to the face by a ping pong ball was epic. Classic.
My son, my wife, and myself were all LMAO's off. I told my son if he ever does stupid shit like that...
Edit: The guy on the gurney with his house on fire. Why was he so upset???