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Why do we say 'Bad Hair Day'?

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While a vast number of idioms originate from historical periods, this is not true of all of them, and ‘having a bad hair day’ is one of these exceptions.

Originally meaning ‘a day when your hair seems unmanageable', the use of this expression has now extended to describe a day when everything seems to go wrong.

The idiom itself originated in the 1992 film ‘Buffy The Vampire Slayer’, when Buffy (Kristy Swanson) says to the one-armed vampire (played by Paul Reubens): “I’m fine but you’re obviously having a bad hair day!”