[The moment she shrieks he jumps back behind the safety of the door, letting out a shrill nyehhh of his own. He peeks back out a moment later, only the top of his skull and eyesockets visible.]

Yes! But don't worry, I'm not spooky nor scary! I'm a nice skeleton! A friend to everyone! My name is Papyrus, and I... didn't realize you'd be so alarmed!