I have a few. This is a bad one. I remember when Super Mario 3 was coming out my local video store brought in a Japanese version of the game, I was the first one to rent the game it was a cartridge for the japenese version of the Nes (Famicom I think) which is half the size of a regular nintendo game. Anyway it came with an adapter and for the life of me I couldn't get this game to work on my NES. I ended up having to bring it back and couldn't play it and it wasn't until a few weeks later they brought a full cartridge japanese version in that worked for me
The other is when the N64 was coming out I was the first or close to the first person to rent the japanese version which was out before the US version. They had it in at the Video Game Trader (I was around when it was called the Toy Trader) anyway playing Super Mario on taht system was amazing, that game blew my mind even though I couldn't read the storyline, lol.
And every system launch up to and including the xbox.