This is a great thread idea! For me, it all started with a little folding pocket knife that I sent away for with the comics in Bazooka Joe bubble gum. It had a very strong tension bar thingy and snapped shut one day on the end of my finger, chopping the tip right off. Mom took that knife away right quick. Next was my father's Buck 102, when I was a very young lad. He was a target shooter and hunter, sadly he passed away when I was very young and most of his outdoorsy possessions had been given away to family or sold. Fortunately mom did hold on to a few items and I found the knife years later while rummaging around in some boxes. I fell in love with the elegance and beauty of it. That was short lived though, as my discovery was soon discovered and taken away "for safe keeping, till I was older". That was the seed though, and I became quite enamored with knives. Soon enough, she caved in and gave it back to me.
Flash forward a few years: while looking through the Consumers Distributing catalog I saw the exact knife that dresner posted (below) and I saved up for it. That knife was the very first thing I ever bought with my own money that wasn't a comic or candy

I had it for a few years, right up to the 9th grade when it somehow ended up in my pack on a field trip and some kid got hold of it and was waving it around. It was taken away by a cold hearted school admin, never to be seen again and I got sentenced to community service.
Right around that time, I started making very crude knives in the garage from any scraps of metal I could find. Well, step-dad (who was always a bit of a douch) tolerated that for a short while and then took them all away. (Does anyone see a pattern here?). That precipitated the gifting of the second knife, pictured below, to me from mom. The Randal belt knife was also my dad's. Somehow I came into possession of the Ruko bowie pictured below. It belonged to my dad, but was given to me by my grand father. The handle was loose and it never felt good in my hand so I never used it. I use the Buck for food prep in the field, i don't much care for the Russel but all three were my dad's and what little I have from him so they will be with me till the day I die.
When I started spending more time out in the woods in my early 20's, I decided a new and larger knife was in order. That's how the Zambezi came to be mine. The day I bought it, my mother-in-law (at the time) who happened to be Army, flight navigator, a keen outdoors person and top-notch-cool was with me. I've used that knife the most and its still a staple in the field. Lots of great memories attached to the ole' Zambezi.
I then acquired the Rambo reproduction below from a scetchy market vendor who told great stories. That and the fact that it was a massive blade equated to AWESOME so I bought it. Tried to carry it out once. Also tried to cut wood with it once. Totally impractical though, never used it again. Still can't understand why I still have it.
Years go by and I'm in a local army surplus store. They have the coolest looking knife in the cabinet and I just HAD to buy it. That's how the Buck 188 came to me. It's also the very first bayonet I ever bought and led to an obsession with bayonets and sharp pointy things in general, hence my user name. I found it to be less than ideal in the field and have not used it much.
Last year I decided the Zambezi wasn't fully cutting it anymore and I wanted something with more blade and heft for chopping and splitting wood. That research led me here and to my unmarked BK9.
Cheers!