my fav of all time was the one during the superbowl when the horse farted, but my fav now is the six flags commercial with the old guy dancing... the geico commercials when they start out for something compleyely different and then go to geico are good too.. i like the hair one [:)]
I also loved the one with the horse farting. As for my favorite, I like the one where the one squirrel runs out in the road and makes a car crash! It's a geico commercial.