I still remember when I discovered MAME. I was always the guy everyone went to for computer advice. Was at a friends house in the mid-90's and he hands me this disc saying "Someone at work gave me this, what do you make of it?"
It was MAMEUI. I put it in the computer, fiddled with it, got it loaded. I'm looking at it and said "I've never seen this before, I think it's..." as I'm scrolling through the list, "These are all arcade games, most of these haven't been released for the PC...Holy @#$@...I think these are REAL!".
Here we are, probably 20 years later, and I now have my name in the list.