Native language is your native language for a reason. While you are a child, attending school, developing, growing up, you learn not just the language but the way you have to think in order to speak that language well, history about your language, little references that only a native speaker would know etc.. As you learn them you wonder why is it like that, why, how and by whom it was created. Once you know about it, you tend to forget these little perks until someone points them out. Although when you travel nobody needs to point them out because they are everywhere. Some are fun, some are just dumb but it’s sure nice to play around to figure them out.