I learn new ways to kill people! Yeah, really educational if aliens were to land on earth and it was up to a bunch of teenagers to save the worlds' communal backside.

All that aside, games are great for this kinda thing actually, some weapon and character names, sometimes even words in the speeches drive me to look up meanings, even names, and it broadens my vocabulary. My mum was less impressed when I had learnt some witty comebacks.