Video games aren't just for pimple-faced adolescents and latch-key kids anymore. They are also for 30 year-old men! And if you're a 30 year-old man that still lives with his parents, then you're likely playing World of Warcraft.
Unfortunately, there is a misconception that all engineers play World of Warcraft, but there is no way we could keep up the required level of addiction and still find time to solve the world's problems.
Personally, my flavor of gaming helps me unwind from a long day's work and sharpens my killer instinct.