Used to hum the Pac-Man theme when going to a flea market as it always seemed to bring good luck. The Mario All-Stars theme on the other hand, brought nothing but a bust every time. I also have what I call a newly acquired shelf, a shelf that I sit new acquisitions on for at least a week after getting them. Hmmm... I also have resealable baggies for modern games, any new, or like new that I get goes into one to avoid inevitable shelf wear.
When playing a none linear game, I always have to explore every nook before moving on and look for hidden secrets. Any games that requires me to input a name for a score or a game save, I usually put me, mee, or something profane. Because why put your actual initials?