This kid is jumping off a dam located at Lake Gordon, and he is extremely lucky he is able to eventually recover from this insane idea.
The final shots show him in the hospital where he is getting treatment for various cuts, and injuries, that happened when he jumped off the dam and slid down.
Maybe he was pressured by his friends, or maybe he did it to impress them. Either way, he will always have the video where he essentially cheated death.
I guess this is survival of the fittest in working order, or else his friends should have been attending his funeral.