4chan's Rules of the Internet — Wetfish touches you.

Rule 1: You don't talk about /b/.
Rule 2: You DON'T talk about /b/.
Rule 3: We are Anonymous.
Rule 4: We are legion.
Rule 5: We do not forgive, we do not forget.
Rule 6: /b/ is not your personal army.
Rule 7: No matter how much you love debating, keep in mind that no one on the internet debates. Instead they mock your intelligence as well as your parents.
Rule 8: Anonymous can be a horrible, senseless, uncaring monster.
Rule 9: Anonymous is still able to deliver.
Rule 10: There are no real rules about posting.
Rule 11: There are no real rules about moderation either — enjoy your ban.
Rule 12: Anything you say can and will be used against you.
Rule 13: Anything you say can and will be turned into something else.
Rule 14: Do not argue with trolls — it means they win.
Rule 15: The harder you try, the harder you will fail.
Rule 16: If you fail in epic proportions, it may just become a winning failure.
Rule 17: Every win fails eventually.
Rule 18: Everything that can be labelled can be hated.
Rule 19: The more you hate it, the stronger it gets.
Rule 20: Nothing is to be taken seriously.
Rule 21: Pictures or it didn't happen.
Rule 22: Original content is original only for a few seconds before it's no longer original. Every post is always a repost of a repost.
Rule 29: On the internet men are men, women are also men, and kids are undercover FBI agents.
Rule 30: Girls do not exist on the internet.
Rule 32: You must have pictures to prove your statements/Anything can be explained with a picture.
Rule 33: Lurk more — it's never enough.
Rule 34: If it exists, there is porn of it. No exceptions.
Rule 35: If there is no porn of it, porn will be made of it.
Rule 36: No matter what it is, it is somebody's fetish.
Rule 37: No matter how fucked up it is, there is always worse than what you just saw.
Rule 38: No real limits of any kind apply here — not even the sky.
Rule 39: CAPS LOCK IS CRUISE CONTROL FOR COOL
Rule 40: EVEN WITH CRUISE CONTROL YOU STILL HAVE TO STEER
Rule 41: Desu isn't funny. Seriously guys. It's worse than Chuck Norris jokes.note
Rule 42: Nothing is Sacred.
Rule 43: The more beautiful and pure a thing is — the more satisfying it is to corrupt it.
Rule 44: If it exists, there is a version of it for your fandom... and it has a wiki and possibly a tabletop version with a theme song performed by a Vocaloid.
Rule 45: If there is not, there will be.
Rule 46: The internet is SERIOUS FUCKING BUSINESS.
Rule 47: The only good hentai is Yuri, that's how the internet works. Only exception may be Vanilla.
Rule 48: The pool is always closed.
Rule 49: You cannot divide by zero (just because the calculator says so)
Rule 50: A Crossover, no matter how improbable, will eventually happen in Fan Art, Fan Fiction, or official release material, often through fanfiction of it.
Rule 62: It has been cracked and pirated. You can find anything if you look long enough.
Rule 63: For every given male character, there is a female version of that character (and vice-versa). And there is always porn of that character.
Rule 64: If it exists, there's an AU of it.
Rule 65: If there isn't, there will be.
Rule 66: Everything has a fandom, everything.
Rule 67: 90% of fanfiction is the stuff of nightmares.
Rule 72: If a song exists, there's a megalovania version of it.
Rule 77: The Internet makes you stupid.

Source: https://tvtropes.org/pmwiki/pmwiki.php/Main/RulesOfTheInternet