I think my first game was a computer game called Reader Rabbit or something like that. It would crash about every ten minutes, and whenever it did so, the error message the computer displayed had a bomb on it. No, seriously, a bomb. It scared the shit out of me, and for years afterward I actually developed a phobia of computers and printers.
After that, there was a certain neuroscience game on the PC that was the stuff of nightmares. Creepy voices, anthro reptilians, terrifyingly stupid puns, and cats that shit paper (I am not making this up). Eniliad knows what I'm talking about.