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Why do people get $13 tattoos on Friday the 13th?

Friday the 13th is considered by many to be an unlucky day. It's a belief that has stretched back to the Middle Ages -- 1,500 years ago, but some people have come up with an unusual way to mark the day.

VIDEO: FOX 10's Stephanie Olmo reports.

Friday the 13th Tattoo Specials:

Golden Rule Tattoo
Oct. 13 until midnight
120 E. Roosevelt St., Phoenix - 602-374-7533
14 W. Camelback Rd, Phoenix - 602-626-7297
$13 with a mandtory $7 tip.

Gypsy Rose Tattoo
11:30am Oct.13 - 2:30am Oct. 14
1505 E. Thomas Rd.
Phoenix, AZ 85014

Cardiff Giant Tattoo
Oct. 13, 10am - midnight
119 W. McDowell Rd.
Phoenix, AZ
$31 tattoos for appointments booked on Facebook
$31 piercings for walk-in clients

Love & Hate Tattoo and Piercing
322 W. McDowell Rd.
Phoenix, AZ 85003
$60 tattoos, of which $13 will be donated to charity
All tattoos require an appointment