Humbug (exclamation)

Humbug was an exclamation the Ninth Doctor used after Charles Dickens refused to participate in Gwyneth's séance. (TV: The Unquiet Dead)

Other realities
In the Daft Dimension, after a worker Dalek asked to have Christmas off from conquering the universe, Ebeneezer Davros exclaimed "Bah! Humbug! No! Get back to work!" (COMIC: The Daft Dimension 546)

Behind the scenes
The use of "Humbug" in The Unquiet Dead is a reference to Dickens' own character, who is widely known for uttering the exclamation.

References in invalid sources
A Dalek once destroyed his television when the Doctor Who Christmas Special was announced, and exclaimed "Bah! Humbug!" (COMIC: Christmas with the Daleks!)