Talking Heads

Why do people insist on talking about things they have no idea about? Don't get me wrong, nobody knows everything about everything, so in no way am I judgmental of circumstances when someone is uninformed. That's fine, it's a normal everyday part of life. And I get trying to hang in quietly when a conversation turns to a topic you aren't overly familiar with. I do it all the time, just waiting for the next tangent that I may be able to add to. But to bring up topics that you don't know a damn thing about and try to speak with authority? Just silliness.