They say bad things come in threes, and it could be the case with 2015.
The superstitious out there could be suffering a bad case of paraskevidekatriaphobia - an irrational fear of Friday the 13th - as tomorrow is our second Black Friday this year.
The first Friday the 13th appeared just four weeks ago in February, and we're in for a third that will appear in November.
It's not a bad omen, just a quirk in the calendar that has landed 2015 with a triple dose of Friday the 13th.
It's happened once before in the 21st Century, in 2009, and it will happen 11 years from now, in 2026, and then 11 years after that in 2037.
The triple Black Friday is set off by a year of 365 days starting on a Thursday.
Friday the 13th can crop up three times in leap years that begin on a Sunday, which happened in 2012.
The superstition of Black Friday could mean tomorrow people will avoid walking beneath ladders and keep watch for black cats on their path. Many people wouldn't dream of setting a wedding date on Friday the 13th.
The superstition is believed to have arisen in the 19th Century, but historians can't pinpoint it to any one event.