"A Biologist's St. Patrick's Day Song" explains the science behind alcohol, from how it's made to what it does in the body.
I may be Mormon (and thus don't drink), but I think the song is great fun (and educational!) nonetheless.
Give this guy a beer. Me? This Saturday, I'll be celebrating the holiday with some Irish soda bread, which I first tasted last St. Patrick's Day thanks to Sarah, who brought it to critique group.