There was a sharp rap on the other side of the bathroom wall.

She'll be sure to look around, if I give it a few good sharp raps.

There was a sharp rap on the glass by Joe's window.

After five minutes there came a sharp rap on the door.

A sharp rap on the door brought her back to the present with a start.

A sharp rap at the door made both of them jump.

Minutes of silence went by; then came a low but sharp rap at the door.

It had all started with a sharp rap at the door.

There was a sharp and hard rap on the closed door.

There were two footsteps and a sharp rap on the door.