When did you get hit by "the tetris effect" AKA playing a video game so much that you get the urge to do moves/actions from the video game in real life?
When I got hooked on Morrowind in middle school it occurred to me to quicksave before a test at school.
I knew I'd been playing too much GTA (would have been around the VC/SA days probably) when I was out driving one day, heard sirens, and looked up in the corner of my windshield to see if I had any stars.