In the past, many Christians would never begin any new project or trip on a Friday, fearing they would be doomed from the start.
Sailors were particularly superstitious in this regard, often refusing to ship out on a Friday. According to unverified legend, the British Navy commissioned a ship in the 1800s called H.M.S. Friday, in order to quell the superstition. The navy selected the crew on a Friday, launched the ship on a Friday and even selected a man named James Friday as the ship's captain. Then, one Friday morning, the ship set off on its maiden voyage... and disappeared forever.
As fishermen say, "A Friday's sail, always fail."
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Friday, Superstition