Spider Jockey

The Spider Jockey is basically a Skeleton riding a Spider.

Strategy
Spider Jockeys are Skeletons and Spiders combined. So kill them quickly with AoE plants or instant kills (not Chomper, it will only eat the skeleton). Remember that a Spider Jockey is 2 mob in one.

Trivia

 * If you use a Hypno-Shroom on a Spider Jockey, the Spider will be hypnotized, but the skeleton will keep shooting until the spider leaves the area or the spider dies, which allows it to walk again.
 * The spider dies first from Peashooters, Cactus, etc. but the skeleton dies first if the plant is a lobbed shot.
 * However, the Chomper will always eat the Skeleton first. The same reason with normal Zombies having to eat through the occupying plants before eating the Lily Pad/Flower Pot.