The first time I heard about Unix was when I was 13 years old, at the University of Natal, Pietermaritzburg campus. Our lecturer did not show up, so a few of us went to search for him. I soon found him in a section the the campus that I was not familiar with, in a darkenned room. He and a few students were hunched over a terminal, typing commands and getting a string of error messages. One of the students asked if he should call the professor, but the lecturer replied that the professor was not familiar with Unix. That was how I got to know it was a Unix system.
About 5 years later I saw an advertisement in a computer magazine for Sun Microsystem's Unix workstations. The high resolution GUI looked so professional to me at the time.
After a further few years, having just upgraded my Amiga computer with a Motorola 68030 processor, I remembered that that Sun workstation had used the same cpu. This got me wondering if I could get Unix for my Amiga. This took some time as I did not have internet access at the time(around 1994). However, I soon discovered that a few PD Libraries(companies that copied and sold public domain/free software at a nominal fee before internet access was ubiquitous) could supply NetBSD!
A few weeks after placing an order, a package arrived that was larger that I expected. It included a stack of 3.5" discs and a single A4 sheet of printed instructions. Following the basic instructions as best I could, I soon had a second hard drive suitably partioned and the development environment set up under Amiga OS. Now all I had to do was compile the BSD Kernel, boot loader, etc! This took many weeks for me to get right but I did eventually get to boot into BSD. Disappointingly, it was just terminal access.
Months later, having orderd a further stack of discs, I finally had X installed and spent many days messing with xrandr to get a decent ouput. By the time I had a 800 x 600 display, and everything else set up to my liking, I found no real need to actually use BSD. Just before deleting it off my system, I had a look through a few discs labelled 'Extras' and discovered XKobo. That game had me hooked.