Although I don't quite agree with bringing attention to yourself and being the life of the party at the table, I also believe you don't want to come off as a non thinking robot unable to interact with your surroundings. The best cover in my opinion is to become invisible. You do that by being average. Just be a person that wants to sit and play the game. If someone wants to talk to you than talk, if something makes you want to interact a bit, like a good streak or a bad one, than talk about it. Don't appear nervous, but it doesn't hurt to have expected reactions to certain hands and plays. The perfect compliment you could recieve on your cover is not being recognized by the floor if you return to a table that you were sitting at just an hour or two before. There is a quote from one of my favorite movies, The Usual Suspects, it goes,"The greatest trick the devil ever pulled was getting people to believe he didn't exist." That is basically true in the casino, they may think of us as cheaters or in a dramatic sense, devils, but if we are just another face in the crowd, for all intents and purposes, we dont exist.