TV. Must watch TV.
He was like a zombie, his eyes constantly glued to the screen as the images and sounds slowly devoured his brain.
If you asked him to count, his face would screw up in concentration and with an effort he'd count up till about three before exclaiming "Oh no! You're making me watch my favourite TV show."
Every programme was his favourite TV show.
It was a wonder he was alive. With all that watching TV, he barely had time to eat or drink or sleep. He never ever went outside for fresh air. He was addicted.