Rule Z 

No matter the circumstance, if a person asks why you own/bought a gun but rejects the answer you give them, the backup answer will always be "Zombie Invasion". This may also be the original answer.
If they reject this answer you are allowed to slap them once, open handed, accross the left side of their face.

If they remain unconvinced then run, you are in the presence of a Zombie and the invasion has started.
Seek shelter and conserve your ammo.

Rule Z-2: Always remember to double-tap.

John: Hey, check out this sweet new 12-gauge I just got!
Jane: Why'd you get a gun?
John: D'know, target shooting...maybe some hunting.
Jane: That's dumb.
John: Ok, it's for the Zombie Invasion.
Jane: Zombies aren't real.
John: <Rule Z> Yes they are!
Jane: <moan> BRAINS!
John: Oh God.<grabs gun and runs>

Rule Z by RenegadeOne December 31, 2011

Rule Z 

Marketing rule: If it can't be sold as is, someone will remove the name and put the word Zombie on it. It will then sell with great success.

We could not sell Dried Seaweed so we removed the label and put Dried Zombie Skin on it. It's never sold better thanks to Rule Z.

Rule Z by Rmistiff December 7, 2011

The Z Rule

The replacing of the last segment of a word with the letter z or -iz, -az, -ez or some similar form. Add whatever form fits the word or sounds the best. Best used typically in context, so as to avoid confusion when "Triz" or "Traz" could mean multiple things; tree, trash, trench, treat, Trish, triad or triarch.

Guy:"Dude, take out the triz..."
Gal:"What?"
Guy:"The Z rule...*sigh* take out the trash..."

"Exclusive message from the truz."
(Exclusive message from the trunk.)

The Z Rule by Shadow62a July 1, 2007

Joe Z Rule

A rule for raffle prizes, that if an individual already owns an item for raffle, that individual cannot win it. This is usually confirmed by showing proof of non-ownership upon winning the raffle prize.

Pocky broke the Joe Z Rule. He won the raffle for mooncakes, but already had aftermarket wheels on his car.

Joe Z Rule by Philip MSPT November 5, 2008

Rule Zero of the Internet 

Rule zero of the internet refers to the most important rule of the internet. Don't f**k with cats.

Hey do you know rule zero of the internet? It's don't f**k with cats.

Rule Zero of the Internet by Phenoniem January 13, 2022

Internet rule zero 

Rule 0 of the internet:Don't fuck with cats.

Garry: Hey! look at this stupid cat lol!
You (most likely):Internet rule zero, RULE ZER-OH

Internet rule zero by Internet Rules 101 July 29, 2022

Rule Zero 

When you're trying to figure out whether doing something is a good idea or not, there are various rules that come in to play, such as Have Fun, Do No Harm, Have Fun (again), What Happens in Vegas, etc.

Rule Zero, the rule that always comes before all the others, the most important, basic rule of doing anything is: "Don't be on fire."

- I can't get this bbq to light.
- Here, use some petrol.
- I am not breaking Rule Zero to cook a burger.

--
- Hey, let's see what happens if I fill my foreskin with lighter fluid and light it.
- I am invoking Rule... wait... yeah, go ahead, that'll be funny.

Rule Zero by tbrd June 16, 2010