With a coffin, the dead person is on the inside.
Nothing
I can sleep with a light on.
A: Because it was a little chicken on the inside.
Because the rain in Spain falls mostly in the plain.
Because Dracula was coffin. Source: A Laffy Taffy wrapper.
Scream and scratch at the top of his coffin.
Body centered cubic
Dinner
A: The dog knows when to stop scratching.
Viola.