Doom 1 is the one that will always hold a place in my heart. The family PC back then only ran at 25MHz and Doom required 33 so my Dad would bring his work laptop home for me to play on. No headphones but it didn't matter, it was such an impactful experience for me as a kid and I'll always remember it fondly.
I got to meet Jon Romero a few years back too - they say you shouldn't meet your heroes but he is definitely an exception. Super nice dude and he blocked out a full hour on his calendar to just chat with me.
Crime, penetration, crime, penetration, crime, full penetration.