When the police come to arrest you after you start a swordfight in a bar, the first thing you say is: "Are you a GM?" or "Sweet! When did the Devs impliment that! Do we have a prison map too?"
You always ask before hitting someone.
You yelled for a GM the last time you locked your keys in the car.
You talk to everyone in less than five words, and it always starts with "about".
You eat an entire pie whenever you get injured.
If any of your neighbors are named Smith, you hang out in their yard all day hoping something will happen.
If the power goes out, you ask the nearest person if Laanx is down.
If some stranger has familiar name in real life, you tell them to wait a bit while you check your logs to see if you know them.
EDit*
When your boss tells you that they are going to train you for a new job, you immediately wonder if you have enough PP.