Good Riddles

Question: When I come in, someone else leaves, I know everyone, yet no one knows me. I'll meet you all only once in your life, Causing mayhem and mischief and sorrowful strife. What am I?

Question: With pointed fangs I sit and wait, with piercing force I serve out fate. Grabbing bloodless victims, proclaiming my might; physically joining with a single bite.What am I?

Question: There's a B in my hand. So what's in my eye?

Question: I can't go left, I can't go right. I am forever stuck in a building over three stories high. What am I?

Question: What do you call a person that has no nose and has no body??