This is gonna be sweet. there are so many to choose from for this, i don't know where to start. Resident Evil is the obvious choice, but you can do zombies ate my neighbours, ghosts and goblins, castlevania, even the zombies from the metroid series (fusion and prime 2 for those who can't recall).
Ooo...Here's a good one, "Stubbs the zombie in: Rebel without a pulse".
Ack... so many choices, hard to pick just one!