Is it not acted/faked?
I think it might be
I thought this, it was the moment the cameraman said 'Im getting out of breath' near the end - it just seemed a bit odd.
No sympathy for the kids, Jackass did this ten times funnier with a loud horn 10 years ago, how on earth they expected this not to happen is beyond me. I agree with what Pie said about what they did was essentially bullying too.