Eli is stealing this from Daniel Davies. I start off by linking to something moronic. In this case it is Phil Chapman's claiming that an ice age is upon us because there was a large drop in global temperature between Jan 2007 and 2008. Deltoid is having fun with it.
Anyone can play by linking to something else that is dumber. Your link has to "follow suit" by being either on the same topic or author, so you would have to find something by Chapman or about a decrease in global temperature. You also have to "bid up", your's has to be dumber than mine, which may be hard as Chapman is pretty dumb, but it's a big internet out there. As d-squared says
The game is open to all and is scored in "King of the Hill" style; at any point, the poster of the last valid card is "King of the Hill". The winner is the person who is king of the hill at the point when we all get bored and stop playing.