Umbrella Rule 

If you come prepared for a situation; most instances the object you brought will not be necessary. Much like bringing an umbrella because of rain in the forecast, but since you have the umbrella, it isn't raining, or won't rain at all.

Ron: Of course it isn't raining the day I bring my umbrella with me.

Mike: Umbrella rule dude, it'll never rain whenever you come prepared.

Umbrella Rule by baked_12 April 24, 2011

Sock rule 

When you have 'socks on' your feet any homosexual actions or statements being made holds a status of being undeniably 'not gay'. This rule applies to past, present, and future events that socks are worn at the time of.

When someone challenges if individual is committing an act that is gay, the individual in question must quickly claim whether or not they have 'socks on' or not. This is done to determine the orientation(level of gay) of said event. A third part is allowed to ask if socks where worn if 'socks on' status is not given.

When an action or event is challenged, and if the individual partaking in the event or action only has one sock on, the individual in question has the right to determine the effectiveness of their sock using the chart below.

Having two socks on is undeniably 'not gay'.
Having one sock on or socks that are located beyond the feet regardless of amount are considered ambiguous and is the responsibility of the wearer to determine if it was 'gay', 'partially gay', 'half gay', or 'not gay'.
Having no socks on while performing or saying something homosexual, will always hold the status of gay.

Having one or more socks on your person while also not being worn in any way, holds no value. The status of this/these socks shall not be used for determining an orientation of an event or action.

Person1: "Yo, I'm going suck that dick."
Person2: "That's gay!"
Person1: "Nah, I've got socks on."

Historical Facts:
The quote below is from the original creator of the discord server "The South(WD-40)" and is the earliest documented use of the Sock rule.
"It ain't gay if you're wearing socks" -Sharken 2017 (alias: Sharky)

Sock rule by LnCw October 6, 2021

Heskey Rule 

The age old FIFA/Pro Evo rule that any goal scored by Emile Heskey is equivalent to 6 goals scored by anyone else, except for George Elokobi, who's goals are worth 19.

In the event that both Heskey and Elokobi score in a single match, "blump saturation" occurs and the rule is nullified.

Ben: "What a screamer by Heskey! By means of the Heskey Rule i'm winning 6-1!"

Jordan: "You have forgotten that my goal was scored by Elokobi, therefore the score is 1-1"

Heskey Rule by Nickolobi January 23, 2010

hand rule

When dating if you have sex with a woman more then five times she considers you two to be in a relationship. No matter from the outset it was agreed upon there were no strings attached there are still strings attached whether the male thinks so or not.

Dude, you slept with her how many times? You shoulda stuck to the hand rule!

hand rule by Kevin J Abq January 27, 2009

50-50-90 rule

Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.

When flipping a coin, take into account the 50-50-90 rule,most likely you'll be wrong.

50-50-90 rule by SonicWolf January 18, 2009

Busty Rule 

When searching anything on Google Images (without safesearch) applying the word "busty" will drastically change the results of the search, usually with gratuitous amounts of pornography and unrelated to the previous search.

Bob: I bet the "Busty Rule" doesn't apply to something like ramen noodles.
Oh shit...

Busty Rule by Busty pikachu October 4, 2010

The 50-50-100 Rule 

An even more hyperbolic variant of The 50-50-90 Rule. In a situation where a subject has a 50/50 percent chance of getting something right, they will get it wrong 100% of the time.

This "rule" was popularized within the Super Mario Maker troll level community by popular Twitch streamer CarlSagan42, and is just one example of a reoccurring joke designed to showcase how easy it is to fool the average player into doing something wrong.

Player: *decides to collect a powerup which the level kills them for in the next room* "It's LITERALLY The 50-50-100 Rule. This happens EVERY time!"

The 50-50-100 Rule by GNFZ April 6, 2021