Actually, even that's not the original source! Among other things, I'm one of the co-organisers of Ignite London, which Tom Scott made this (very, very cool) video/presentation for. The video was filmed by another organiser (Richard) for Ignite London, so this is really the REAL original source (just to be pedantic) -

http://vimeo.com/channels/ignitelondon2#10060159

or

http://ignitelondon.net/videos

Another amazing presentation from that night (there were plenty) was the one about the price of chocolate bars, showing the use and abuse of statistics:

http://vimeo.com/channels/ignitelondon2#10052795

Thanks!