Based on a really old thread I made similar to this. At school, I'm very notorious for being a fish keeping geek and some people have dubbed me "that fish kid". Anyways, some kid asks me in one of my classes "OH DUDE, YOU KEEP FISH RIGHT? THAT MEANS YOU KEEP GOLDFISH RIGHT?" And some time later some kid gets on the subject of goldfish (I was eating goldfish crackers in class) and he says that his died because he didn't have a filter. Some girl behind him said "YOU NEED A CLEANING FISH" I told her this "Catfish like plecos don't eat poop, and even if they did they'd still excrete waste from doing so" and she just says after a 5 second pause "WELL UM TECHNICALLY THEY ARE" *facepalm* Have you ever heard something like this from people? I've heard far too many to count, but these are the most recent.
