I thought the first Geico pig commercial was hilarious. "Wee wee wee all the way home". I also like the "When pigs fly" one. Most of the rest are totally stupid, especially the one with the pig and a girl on a date. And I'm not crazy about the gecko, either. (Why does he have an English accent?) Although the one with the Roadrunner and Wile E. Coyote is priceless...
The biggest problem I have with Geico's commercials is that they repeat them incessantly, and it seems like the really irritating ones get the most air time!