The Grapeshot is certified to blow you out of the water. It explodes like a cherry bomb and shoots grapes that bounce around and kill u. It's got a lot of pictures to help you put the grapes in the right way. But if you can put them in any way you want if your too lazy to refer to the pics.

Grapeshot Wiki: http://plantsvszombies.wikia.com/wiki/Grapeshot