My first ever shiny was a Ratatta on route 22 in Gold version, except I didn't know what shiny pokemon were, so I didn't catch it. I thought the red gyrados was just a special thing that they put in the game, and something like that wouldn't happen again, so when I saw a yellow Ratatta I freaked out and thought my game was broken, and immediately turned it off fearing my save data was in trouble. It wasn't until gen 3 that I learned better.