Letting my grandparents ever by me fish as a child? They knew less than me, and I was 5! They bought a 10 gallon, immediately tossed about 25 goldfish and..well, I thought they were minnows at the time, but they could be something else? I think they were minnows! By the next day(my birthday party where they were going to give me the fish) all but three had died! So I had three tiny fish in what I thought was a huge tank! Two of them lived for a couple months, but I managed to have one live for four years! Surprising considering we had no filter and I have no memory of any water changes at all, unless my parents did them while I was at school which I doubt!
So sort of a lesson learned through someone else's mistake? Either way, when I learned that goldfish DO live longer than 'a couple weeks' and instead live years..Well, golly. That's the reason I joined this forum, I didn't want any surprise mistakes by listening to the people around me! O_O Honest, up until this year, I thought goldfish had the shortest lifespans of all the fish, and the goldfish that get giant were a different species!