DOOM was THE FIRST PC game I ever played. I was at a friend's house and he knew I was a comic book geek. He called me over to his desk and said, "Hey man, check this out," of course it was DOOM.
Up until that time, I never saw a reason to have a HOME PC, I just saw them as word processors or accounting tables. At that same time, my brother in law was a freshman in college and his dad had JUST bought him a Hewlett Packard PC for school. The first thing I did was go out and buy the diskettes for DOOM. Every time we went over to my in-laws, I found myself eating dinner as fast as I could and then going to the "back room" to get on that PC and play DOOM. It was running a bit slow so I bought more RAM and it ran great. I can't remember how many nights my wife fell asleep on her parents couch so I could play DOOM.
I specifically remember playing late one Friday night (my brother in law remembers it too). I was on the FINAL level. It was late, I was tired, the music was especially eerie, and the computer just started freaking out! The game went fast, it went slow, the music got loud, then soft, the loud again. At that moment in time I (almost) seriously believed that PC had been possessed by the Demons of Hell!
Soon after, I bought my own PC and really got into them. From that point on I bought about every shooter imaginable. I think the first one I played after DOOM was DARK FORCES...
So THANK YOU DOOM, for many great years of PC fun!