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While breaking a mirror or walking under a ladder may be well known superstitions, research to mark Friday 13th has uncovered some of the most bizarre worries of British people.
Conference call providers Powwownow surveyed 2,000 people asking the question: "Do you have any superstitions?"
Here are 10 of the weirdest responses, picked at random:
Do you have any unusual superstitions? Let us know in the comments below...