I'm trying to find that one episode where George suspects the really tall guy of stealing some sort of little statue from his apartment. Jerry meets the tall guy in Monk's, with George sitting in the booth behind them. George mutters stuff like "You mean alias" and then confronts the guy with stuff like "I'm the judge and the jury, and the verdict is in... GUILTY, with a capital T!"
I can't find that episode using the search box on seinfeldscripts.com though. Keywords like judge, jury, alias, verdict, guilty don't find it.