I distinctly remember myself and a lot of mates who played the original DOOM when it came out, started having very worrying dreams. Nothing horrendous but it was such a novelty at the time so we played it a lot, we even played it at work after hours. Despite it being very pixelated, your mind tends to smooth images and fill in the gaps and it did turn a lot of us off gaming for quite a while. The mind is a very sensitive machine and should be looked after carefully.
Biting the hand that feeds IT
