I would have done better in many of my freshman classes if Quake 2 had never been released. I remember playing until the sun came up on school nights, making learning things in class that day very difficult. I fell asleep in physics more than once, and missed it repeatedly. I still got my EE degree.
Other significant distractions included:
A long distance relationship that was on again / off again.
Conversing with my intellectual peers. For the first time in my life I was surrounded by very smart people, and it was intoxicating just to talk with them.
