Maybe you see a plant you have to collect in game or a rock wall that looks different. What items have you caught out of the corner of your eye that you realized was just your brain so focused on looking for things in a game that you saw it IRL and made you double take?
Every time I’ve had to move into a new place, I catch myself humming at least one of the 3 Tetris songs without realizing it while packing boxes or a vehicle. Usually it’s Music-1 or Music-2.