It is a fake. There are others that have gone round in the past and have the same ending to it. Please don't post it though, it's not something that's exactly easy to watch.
Seen the one of some poor bloke getting abuse from a chav only to lamp him, made me laugh!
Is that the ones where the cage fighters are on some sort of fancy dress night out and they are dressed up as a couple of laaaaaaayyyydies. A couple of drunken chavs try to attack em and the cage fighter floors them with one punch. Quality vid!
There are loads of quality vids on youtube. My tendancies seem to be watching people get internet bullied after they post a stupid vid(it makes me feel like a big man)