Here, I'll start. When I was 8 years old, my parents went to a dinner party and plonked me down in front of the host's computer so I'd stay out of their way. The game they booted up to keep me occupied was Space Quest II. Little did they know what impact that would have on me...
The first time i ever saw an adventure game, i was too young to really comprehend what it really was, i saw my brother playing Zak McKracken, and it seemed "grown up and boring" to me, but what made me realise the magic of what adventure games are, was watching my cousin play monkey island on the amiga, and i remember he was playing the part where you use a rubber chicken with a pulley in the midle to go to hook island.. he had to go back and forth on the wire a few times because the sound it made had me in stitches.
First AG i really played (i think) was Kings Quest 3, but at the timez me having mediocre english, and being more used to my NES, which didn't require me to type in english and just had four directions and 2 buttons, i only dabbled a little bit, but the parser put me off..
Then i was bit by a radioactive shadowgate and deja vu on the NES, (which are first person point and click games that actually kinda work on the console system,) and it finally awoke my true adventure gamer powers, and have loved them ever since.