If you are interested in checking out more of Cosmo's videos, check out his YouTube channel and prepare yourself.
http://www.youtube.com/user/CosmoSpeedruns

I'm an Engineer and built the video game community Cheerful Ghost and text based mini-MMO Tale of the White Wyvern.
That's an incredible video. It's quite impressive how many hours have been dedicated to finding glitches and developing speed run strategies around them.