Someone who pointlessly knocks on the door.
A watermeloin.. Don't worry, I remember where the door is.
Hnng. Aaaaaaaah. Like that. I'll show myself the door.
A bird who knocks before delivering its message !
Knock on the door
Nothing as they cannot breed with each other
Not Islam
Someone who knocks on your door at 6 a.m. for no reason.
Work smarter not harder people.
DogMa
None. They don't believe in a higher power.