Setting: a lone house stands on a Scottish moor. The fog is dense here. It is difficult to estimate where your foot will fall. A figure in a cloak stands in front of the door.
Figure: [rapping on the door, in a Highland accent] Knock knock!
Voice from inside: Who’s there?
Voice: Glivenko who?
[The fog along the moor converges uniformly on the house, enveloping it completely in a cumulus.]