I take it back. David is not the silliest-looking skeleton.
What can I say about Papyrus? He is a cartoon villain with an actual Skeletor laugh who is terrible at his human-hunting job. In fact, the army he's trying to get into is full of adorable, fluffy dogs, and they're still better at hunting down humans. Instead of trapping and/or killing the human he's after, they go on a date and become best friends.
Not a good representative of skeleton-kind.
...just don't tell his brother I said any of this, though, or I might have a bad time.