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Hair dryer

From Futurepedia, the Back to the Future Wiki

Doc surveying his 1985 hair dryer among his belongings
The same hair dryer doubles as "Darth Vader's" ray gun
"A hair dryer? Don't they have towels in the future?"
—Doc to Marty

A hair dryer was a device used for drying hair. Emmett Brown had packed one in his suitcase which he placed in the DeLorean time machine in 1985. When Marty McFly escaped from the Libyan terrorists, the suitcase with the hair dryer was transported to 1955.

1955 Doc opened the suitcase and found the hair dryer, along with a Playboy magazine, something which had just premiered in the world just two years prior.

Marty would use the hair dryer as a "ray gun" in his "Darth Vader" persona.

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