Now this link may go down at some point because it may be a copyright infringement on the part of the uploader, but I will post it here and say beforehand that the video and all rights to it belong to (as it looks) the UFC and ESPN. Without anymore of my incessant shit here ya go with one of the best main event KOs in the history of MMA.
Anderson “The Spider” Silva KOs Vitor Belfort in the 1st Round via Bad Ass Head Kick (UFC 126)