Weirdo

Has this ever happened to any of you? A stranger suddenly popped into a closed discussion room in the library where you and your group members are in a middle of a discussion.. He opened the door, came in and said.. "Hey.. What are you doing? What course are you studying? Where are you from? Can i come in and sit? What book are you reading?" (*eyebrows raised*)He just invited himself in as if he was welcomed.. Ain't that rude and weird!!!