Dean took the opportunity to knock on Martha's door and step inside.
That was when some inconsiderate soul decided to knock on their door.
For the second time in a few minutes, there was a knock on the door.
Before Dean could let loose with a torrent of pithy comments, there was another knock on the door and Donnie entered the room.
They entered a quieter wing, and Jenn stopped to knock on a closed door.
There was a knock on the door and before Dean could respond, Corday entered.
Cynthia took up a pencil and paper again and began listing the different letters but almost as soon as they'd begun, they were interrupted by a soft knock on the door.
A knock on the door brought only silence.
Before Dean could answer, there was a knock on the front door and he rose to answer it.
I'd better get cracking on that, knock on doors or something.