Fivehead's Law

Similar to Goodwin's law
A term that originated on Signal. Fivehead's law, short for Fivehead's law of gun posts, is an Internet adage asserting that as an online discussion grows longer, the probability of Brian bringing up guns approaches 1.

Fivehead's Law
Random dude: "Cornell has a swimming course that is mandatory for all students."

Brian: "Why don't they teach something more useful like shooting guns?