User blog comment:Crazyzombie168/Plants vs. Zombies 2.5, a PvZ fan-game being created by Crazyzombie168 and Lolwutburger!/@comment-26945790-20151102134909

I have an idea:

Briefcase Zombie

TOUGHNESS: Protected SPEED: Stiff

Leaves a briefcase which contains a special chemical when dies.

Special: chemical makes zombies invisible (like Thief Zombie)