Crazy Dave

Crazy Dave is one of the major characters in the game. He wears a pot on his head, presumably to protect his brains from being eaten. During Adventure Mode, Crazy Dave serves as a sort of narrator, introducing the player to certain levels and explaining some of the Mini-games and Bonus Levels. He is later abducted by a Bungee Zombie on level 5-10 right before he can tell the player Dr. Zomboss' weakness. He also has a shop called Crazy Dave's Twiddydinkies that he runs from the back of his car, once the player finds his car keys. He sells several plant upgrades, extra defenses, and Zen Garden items.

When re-playing Adventure Mode, Crazy Dave will randomly pick 3 of the player's plants for each level, which can't be switched out, but quitting and reloading the game makes him choose three different ones.

Crazy Dave will buy a Magic Taco, found only on level 4-4 of the first play-through of Adventure Mode, for $1000. He will also reward the player with two Marigolds when the Zen Garden is unlocked.

Pop-culture Reference
Crazy Dave is probably based on a series of commercials in the 70's and 80's for a consumer electronics company 1 in the northeastern United States. Jerry Carroll, a popular radio disc jockey, played the frenetic host with the memorable slogan, "Crazy Eddie, his prices are IN-SA-A-A-A-A-ANE!". It should be noted that Jerry did not actually play Crazy Eddie, but always referred to him in the third person.

Trivia

 * In the credits song Zombies on Your Lawn Crazy Dave is being held upside-down by a Bungee Zombie (probably the same one as in 5-10), but his pot does not fall off his head.
 * There are only two times it is ever seen off his head in the entire game. The first is when he says "BECAUSE I'M CRAAAAAAAZY!" while introducing level 1-5. His pot flies up in the air, does a flip, and falls back on his head. The other time is when he is kidnapped by the Bungee Zombie before battling Dr. Zomboss, when his pot is seen tumbling to the ground.
 * Presumably the Bungee Zombie did not have hold of him from the beginning of the boss battle to the music video, because his pot had fallen off when he was kidnapped, yet he has it again.
 * If you hang around long enough in his shop without doing anything, he might say "I eat food off the floor!".
 * Crazy Dave never blinks, but does wink with his right eye.
 * In the last level, before he gets abducted by the Bungee Zombie, while trying to recall Dr. Zomboss' weakness he mentions the Konami Code (up, up, down, down, left, right, left, right), but he quickly realizes it is the wrong thing and moves on.
 * If the code is entered in-game, a popping sound is heard.