Taco

The Magic Taco is an item obtained at the end of Level 4-4 in Adventure Mode on the first time it is completed. After the level, Crazy Dave will take the Taco and give a diamond in return. He will also show the player new items at his shop, like the slot for the Gloom-shroom and Cattail. It is unclear what its magical properties are, or why Crazy Dave would pay $1000 for it, but this may just demonstrate his craziness. It may also have to do with the cardboard plants moving and attacking the zombies from the I, Zombie levels.