My dad used to hand his Pentax over to me on occasion when I was little in the 70s. I don't even remember which one it was (K-1000 maybe?) but I loved the feel of it in my hands and the satisfying click of the shutter. Then I owned a few terrible 110 cameras and then an even worse Kodak Disc camera. I took some terrible kid photos during that time.
A few years later, a family friend gave me his ME Super kit when I was in high school. It came with the M 50/1.7 and an M 135/2.5. It even had an auto winder for action. I loved that camera and took it with me when I moved from the Midwest to Colorado and used that for a few years skiing, hiking, and traveling.
Digital arrived and I had a few compact digital cameras: aSony, a Canon Elph, A Canon S2 but I wanted more and starting looking at dSLRs. Then I got my first dSLR, an Olympus e510. That camera was ok but very noisy above ISO 400. I wanted to expand my lens collection but the lenses I was interested in were expensive and I didn't have much money. I decided to sell the Olympus and buy a Pentax K-x so I could use my old 50 and 135mm lenses.
Since then I have stuck with Pentax, maybe not so much for loyalty but because I liked them and I had an investment in the system. Since that K-x I've gotten the following Pentax bodies: K-5, K-3, K-S2, K-1, K-3iii, 645, and 645D. I also now have many lenses, both modern and vintage.
I might get a GFX at some point if we don't see much more action on the Pentax MF front but I'm in no hurry at the moment so I'm waiting to see if we get a Zii or something like that.