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Wiktionary
bad penny

n. 1 (&lit bad penny .=: English) A counterfeit or damaged penny. 2 (context idiomatic English) A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times.

Wikipedia
Bad Penny (TV series)

Bad Penny was a CBBC sitcom written by English comedy writer Dean Wilkinson. It ran for two series (13 episodes) from 2003 to 2004.

It starred CBBC presenter Anne Foy as the happy and sweet, yet troubled, Penny Dreadful, who was constantly trying to thwart the surreal and crooked dealings of her wayward family. Penny’s dim-witted and henpecked father, Pa, was played by comedian Graham Fellows a.k.a. John Shuttleworth.

In each episode, Penny would also have to contend with strange and bizarre characters that stumbled through her wardrobe, an occasional portal to other worlds and dimensions. The noble Penny always strove to help characters such as a foul mouthed runaway scarecrow, a Dickensian rat-catcher chasing a giant rat called Lord Ironside, and Chips - a Geordie space pilot dog in a story that borrowed from the plot of the 1968 film, Planet of the Apes. Indeed, the show’s running catchphrase "This is a mad house, a mad house!" was taken directly from the film and was uttered once in every episode. The humour was a surreal blend of slapstick and intelligent dialogue with Pythonesque self-contained stories, sub plots and throwaway vignettes.

The show's cast boasted a regular troupe of actors who played different parts each episode, including That's Life!'s Adrian Mills, Coronation Street's Martin Hancock and character actor Rusty Goffe who appeared in the original Willy Wonka & the Chocolate Factory as an Oompa-Loompa, and the original Star Wars as a Jawa and a Droid. Goffe, coincidentally enough, played Goober in Stupid!, another CBBC show written by Dean Wilkinson. Series 1 was directed by Graeme Harper, who directed 1980s episodes of Doctor Who as well as episodes of the 2006 series featuring David Tennant.

Bad penny

Bad Penny may refer to:

Usage examples of "bad penny".

And yet, here you are, turning up like the proverbial bad penny to ruin my day yet again.

But, with the help of a friend who asked why both Black Jacks couldn't be dead and buried, I got inspired, and here I am, like another bad penny.