The Chumblies were a species in the holovid show Doctor Who?. Yani Mamora, a fan of the show, once threw herself in front of one that was attacking the Doctor. She was knocked unconscious and the Doctor mused that it might "knock some sense into her."
The Ninth Doctor noted that he had met the real Chumblies before, causing him to grow more suspicious of the holovid world. (COMIC: Doctormania)