This is a great thread. The first knife I remember seeing was a 'hunting' knife that my Dad kept in the glove compartment of his car. It seemed like a huge knife to me as a kid, and it was strictly OFF LIMITS. He gave it to me a few years ago, and it is a smaller sheath knife made by Western. He said it was his Boy Scout knife when he was a kid. It is the top knife in the following picture:
The knife in the bottom of the pic was my Grandfather's 'hunting' knife. It is also a Western. My Grandfather had a black old Timer large stockman when I was a kid, which was another knife I remembered early on. That knife was HUGE!
One of my first knife using memories was of my Grandfather teaching my the game Mumble-dee-peg, where you squat or kneel on the ground, and you have to stick a knife in the ground by flippingit off your hand various ways. When you missed a stick from one position, the next guy got a turn. That was how he introduced me to pocket knives. It was a good way to get a kid comfortable with handling a pocket knife.
My first knife was a black-handled basic camping-type pocket knife. I found it in the woods behind our house after I stepped on it (it was closed, but my foot rolled on it). It had a main blade, a can opener opposite a bottle opener/screwdriver, and a fork. I think I was 9 when I found it, and that opened the gates of knifedom for me. My parents would never let me play with or purchase knives when I was a kid, but once I acquired that knife, things changed, and they let me buy goofy souvenir pocket knives and such.