Rules We Follow Without Knowing Why

Everyday customs and conventions stick around because doing things the same way is much easier than changing. Sure, you can come up with a better way, that will save time, effort, or money, but the process of change itself can be more trouble than its worth. So we've ended up saying "knock wood" instead of saying, "Oh no, I hope I didn't jinx myself by saying that." Everyone knows that's what you mean. YouTuber Chill Dude Explains goes through ten very different examples of things we do even though we've long forgotten why. Some, like the scrubs that surgical teams wear make plenty of sense once you think about it, although you've never had a reason to think about it before. But the most common background story is what you would expect- customs to appease deities or keep demons away. (via Laughing Squid)