When you cannot reveal a secret because it is so sensitive, it will offend those around you. By citing the decade rule, in doing so you agree that ten years from that date you cite it, you will reveal the secret.
Me: Ross, where were you last night?
Ross: I'm citing the decade rule on this one
Me: Damn, I'll mark the date
An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"
Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."