The internet is full of folks who want to act like smarty-pants. Online, anyone can be a know-it-all with a simple visit to Google and even their opinions. Granted, there are times when others get humbled by someone better informed and versed in one topic or another.
There's a group that collects such interactions, titled r/Don'tYouKnowWhoIAm. Medical, science, and other experts lurk on the internet too, waiting for their chance to put jerks in their place. So, here we present to you the newest collection of cases when folks didn't quite know they were talking with a person they were talking about. Get ready to feel some mild second-hand embarrassment!