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Never knowingly be serious. A rule created by the Doctor in the popular BBC series Doctor Who during the series 6 episode "Let's Kill Hitler".
(The Doctor comes out wearing a tux and a top hat.)

River: You're dying! And you stopped to change?

The Doctor: Oh, you should always waste time when you don't have any. Time is not the boss of you. Rule 408. Amelia Pond. Judgment Death machine. Why am I not surprised? Sonic cane.

River: Are you serious?

The Doctor: Never knowingly. Never knowingly be serious. Rule 27. You might want to write these down.
Rule 27 by Sophia42 November 14, 2011
Related Words
Rule 34 Rule Rule 35 rule 1 RULE #1 rule 2 ruler Rule 11 rule 43 rule 69

rule of half past four 

The rule that if you listen very seriously and intently, with a deeply caring expression, to anyone until 4:30 a.m., they then must have sex with you. Sometimes a verb as well. Comes from the original, good version of Bedazzled, with Peter Cook (as the devil) and Dudley Moore (as the guy being tempted).
"Have you thought of just applying the rule of half past four?"

"What is it?"

"If you can stay wide awake and gaze at her thinking 'You are fascinating,' the whole time she talks, for everything she says, no matter how pointless and no matter how stupid, till half past four in the morning, you're in." (Not an exact quote)

I wanted her so bad that one night when she was drunk and dumping all this self pity, I kept telling her what an interesting person she was, until I finally half past foured my way into her pants.

rule number 2 

i'm gonna walk away, you know rule number 2?
rule number 2 by phatskinnyguy August 3, 2019

rule 360 

If a 15-year-old girl or older is wearing shorts or pants that show off their ass, you have permission to drop kick them.
Girl 1: OOH! I love your shorts! SO CUTE!
Girl 2: I know! It shows off my bubble ass very well *shakes it*
Boy: RULE 360!!!!!! *kicks her ass outta there*
rule 360 by Sonicwave.exe May 10, 2021

rule uno 

Whenever you are in a math class, you MUST have a deck of uno cards. Type doesn't matter, just have a deck.
Teacher: that's all we have for today. Take a break
Students: *sit there and do nothing*
Nerd in the back: rule uno
Students: *start tryharding at uno*
rule uno by Sonicwave.exe May 11, 2021
The only thing that can go faster than the speed of light, without breaking the laws of physics.
guy: makes character
0.000000000000000000000000000000000000000000000000000000000000000001 nanoseconds later
other guy: makes rule 34 of character
Rule 34 by Cole Anderson April 8, 2022