Fear of the number 13: A morbid fear of the number 13. Also known as triskaidekaphobia. Written reference to the superstitious fear of the number thirteen dates to the late 1800s. The term triskaidekaphobia first appeared in the early 1900s. It was derived from treiskaideka, the Greek word for thirteen + phobia, fear of = a fear of thirteen.
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A guy struck up a conversation with a young lady in a bar. After a half dozen drinks, he suggested they get their own bottle and retire to his motel room, and she readily agreed. "Say, how old are you, anyway?" the guy asked.
"Thirteen," she replied with a shy smile.
"Thirteen? Thirteen!? My God, Girl! Get your clothes back on at once and get the hell out of here! Are you crazy?" he thundered.
Pausing at the door as she left, the girl smiled. "Superstitious, huh?"