Hello, I’m Mr. Null. My Name Makes Me Invisible to Computers
10 years ago I worked for Jagex on RuneScape, an RPG. There are rules for that game about conduct and so on - no swearing, no scamming, blah blah. If you see someone doing something "bad" you can report them and the customer support team reviews the event and can allocate "black marks" on players who infringe.<p>One particular user accumulated thousands of black marks. We thought they were doing something incredibly bad. A black mark gets you banned for a short period of time, this player was banned for a millennium. But they kept sending messages saying that it was unjust, they did nothing wrong.<p>Turns out their playername was 'null' and half of other players' offences were attributed to them due to null in Java being cast to 'null' curing concatenation...