Peashooter

The Peashooter is the weakest weapon in the game, doing low damage, unable to hurt blubs, but at least has better range than the boomerang. Of course, it shoots peas, (but not literal peas) hence the name.

When you get the Devastator though, it deals roughly the same damage as the boomerang, but not as much as the Rainbow Wave.

If you wait in the pause menu long enough, one of it's bullets will bounce around the screen.