Which is worse on a plane: A yapping dog or a screaming baby?

Or a stinky seatmate, or one that never shuts up? The list of things air passengers are and do that annoy their fellow travelers are legion. Which do you find most obnoxious? Head over to Elliott.org and register your vote on what makes for the most annoying seatmate ever. For me, the screaming baby is the hardest to take, closely followed by one not on Chris's list: The seat-kicker. I swear I've taken some shots to the kidneys from kids in the row behind me that would put Ali to shame.