Oh yes, I think everyone has them.
In the middle ages and the renaissance astronomers worked out a system of "dangerous" days and advised people not to do important things on such days.
Most countries have superstions such as Friday 13th, some Christians feel one should not work on a Sunday, some people hesitate to begin a new task on Fridays, irrespective of the date.
In Scotland there is something known as McPherson's law:
McPherson's piece aye falls jeely-side doon.
A piece is a slice of buttered bread with or without "jeely" = jam. And whichever McPherson the saying refers to was certainly both clumsy and unlucky!
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