Back in the 1980s, I worked in an electronics factory and we used to play a card-shedding game at lunchtime; follow suit and number, Jacks reverse direction, 8s miss a go. I became bored of that and started Tippexing some of the cards and adding my own rules. I gave the cards bawdy or slightly risqué names, just to keep the lads at the factory interested.
Fast forward to several years ago and I decided to design the cards, box and rules on my computer, make everything in Czech and English and have 1000 copies made. No market research, no focus group – just my set of made-up rules just to suit myself.