At Penguicon 4 in 2006, Nifty Guest Howard Tayler of www.SchlockMercenary.com took this video of Penguicon co-founder Rob Landley throwing a bowl of liquid nitrogen in the swimming pool, and the resulting billow of fog.

youtube.com — "The Commander in Chief Test," from Humanitainment, the folks who brought you "The Empire Strikes Barack." It's the funniest McCain video I've seen. (Resubmitted because the McCain bury brigade sunk first submission despite 180 diggs in the first 2 hours.)