We haven't seen any of the source videos in question, but judging from these reactions, we really don't want to, and the various underlying soundtracks you can hear in the background (piano, death metal) are therefore even more disturbing. This is like the adult version of those kids in pain videos.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.