Specifically, I used to play a lot of Kung Fu Master as a kid, and I'm quite sure that this is what caused me to never learn kung fu. Likewise, hours spent at Contra clearly dissuaded me from joining the special forces to fight aliens in Central America.
UPDATE: More evidence for Hajdu's thesis:
Notice how playing the video game utterly drained the enthusiasm from the normally ebullient J Mascis. I can't imagine the herculean effort it must have taken for him to later pull himself together to put out one of the best albums of 2009.