'I had to explain to a girl that penguins were not fish': 20+ People who shared their impressively dumb ideas out loud

Truly, how did these people ever make it through school without knowing such basic information? In this incredible post to r/AskReddit, one person asked people to tell them all about the dumbest people in their lives. And thousands of comments rolled in, sharing hilarious stories of people who made all kinds of goofy mistakes. While some of the people in these stories were children, a decent amount were adults or teenagers. It's really surprising how someone tells you an incorrect random fact when you're a child, and then you just believe it for a really long time. If you're never corrected on that tidbit of information, that's how you end up on the long list of people below. Next up, this coffee shop barista has this annoying regular who never tips, so she found a way to get back at her that's both clever and mildly annoying for the customer.