Someone who pointlessly knocks on the door.
When it's ajar.
The doors were open.
A Tippihedron
Because freedom rings.
Ginger-bred
A melancholy.
Nobody asks, 'who's there ' when you try and tell a knock knock joke.
Someone knocking at your door for no apparent reason.
Because they don't bother Him with incessant prayer.
A-pasta-ate.