"Rule Fifty-One" was the title of the 7th season finale of the TV show "NCIS," referring to Special Agent Gibbs' established 50 rules for being a special agent of the Naval Criminal Investigative Service. At the end of the episode, in which he needed a lawyer, he went through a box with pieces of paper on which he'd written his rules, and one said, "#13 NEVER, EVER INVOLVE A LAWYER." He turned it over and wrote, "#51 SOMETIMES YOU'RE WRONG." A major admission for Gibbs, even to himself. If he can admit it, we all can.
McGee: "Tony, Affleck didn't start playing Jack Ryan until 'The Sum of All Fears.' Alec Baldwin played Ryan in 'Red October.'"
DiNozzo: "Seriously, McGeek? YOU are challenging ME on a movie reference? I'm always right about these things, especially when Sean Connery is in the movie!"
Gibbs (slapping DiNozzo on the back of the head): "Rule 51."
DiNozzo: "Ow! Oh yeah: 'Sometimes, you're wrong.'"