Braincicle

Braincicle is a zombie in Plants vs. Zombies 2. He has an icicle on his head that can stab through lobbed projectiles tossed at him, which he can then throw back at the plants.

Overview
Braincicle can absorb 30 normal damage shots. The icicle on his head changes its appearance upon 8 and 15 damage shots. It falls off the zombie's head at 20 damage shots. The zombie's arm would fall of at 25 damage shots. Braincicle appearing in a level can desperately change your seed loadout, because of his ability to stab lobbed shots on his head icicle, and toss them back at the plants.

Strategy
Although lobbed plants are out of the question, there are still many things you can use to kill Braincicle. For instance, straight-shooting plants will not trigger Braincicle's ability to stab the shots on his "hat". Another strategy is ground plants, which are invulnerable to almost every zombie. As such, Braincicle also won't do any harm to these plants (other than Potato Mines), and will hurt him. A last resort is to use instant kills. These zombies don't appear too often, so an instant kill would resort the problem in a timely manner. However, be wary of the usually long recharges of instant kills, which may not come back by the time that another Braincicle appears.