Peter Kranz in the fog is a scene in Downfall that is rarely used in parodies.
On one hard foggy day, Peter Kranz is walking on the streets of Berlin in which he then stops and sees a woman wearing a gas mask who is pushing a stroller that is covered by a blanket going past him in the opposite direction. He watches the lady pass by and continues walking.
Due to the lack of any dialogues in this scene, it is very rarely used in parodies, and when it is used it's only within longer feature-length parodies, never on its own.
A short segment was used by mfaizsyahmi in his Detective Kranz parody, a spoof of a Detective Conan opening, along with many other obscure clips from Downfall that features Peter Kranz and more or less matched the original opening.