How Many Zombie Movies?

Ok, so the title is a bit deceptive - i am not asking how many zombie movies there are, or even what the titles are. Instead i have a question for those reading this blog:

Situation: the other day i went to my local Blockbuster to hire some zombie films. As i was looking at which titles they had i thought "how many zombie movies can i hire at once without seeming like a weirdo freak?"

I asked a few friends and they said two zombies movies at once was acceptable, but anymore would be bad. Oddly enough, i had hired only two movies, but that was because that was all they had i stock at the time.

So i ask any reader of this blog the same question: "how many zombie movies can you hire at once without seeming like a weirdo freak?"