What should I do with my hands?

I’m a film major which means I spend a lot of time watching movies I have to watch intently in order to properly digest but I’m often tempted to play Tetris Angry Birds and other distracting games If I don’t I find myself cracking my fingers about every ten minutes which can’t be good for my joints I’m one of those people that cracks each finger about 5 times, so Since I’m viewing films upwards of 15 hours a week I reckon I ought to be able to turn that time into some sort of positive something

I’ve considered knitting but it doesn’t really appeal to me Sometimes I just squeeze a stress ball Get tired of that pretty quick

Does anyone have any ideas of some good work I could put my hands to while 1 Not paying too much attention 2 Sitting in the dark and 3 Remaining silent