Board Thread:Plants vs. Zombies 2/@comment-25089892-20150602192750/@comment-24760547-20150605205054

Xenons wrote: But then, how are Coconut Cannon and Dandelion able to make him drop the magic shovel? And why can't Lightning Reed do the same thing?

Because Dandelion and Coconut Cannon's projectiles deal splash damage, meaning the effect is dealt to both the invulnerable shovel, and the zombie.