21) You're playing Lair.
22) You own more clothing with game logos/references than without.
23) You remix NES music.
24) You spend hours searching for NES sprites to spend more hours putting them together with Pixelblocks
25) You listen to nothing but game music
26) You're following fashion trends for The Sims.
27) You build and sell special gaming shelves.
28) You make a game about table tennis.
29) You buy a game about table tennis (go outside).
30) You believe those game design school commercials and seriously consider calling the number. ("Tighten up those graphics in Level 4!")