Thousands of people around the world donned zombie costumes Saturday to mark World Zombie Day, a charity fundraiser filled with fake blood and braaaaiiiins.

Founded in 2006 in Pittsburgh, where Dawn of the Dead was filmed, the event now attracts participants from around the globe, including London and Paris.

Participants attend the "Zombie Walk" in Paris.
Ian Langsdon, EPA-EFE

Organizers say Pittsburgh’s Zombie Walk has established three world records through the years. Participants are discouraged from touching anyone as they shamble around and to avoid smearing fake blood on walls, signs or buildings.

"Please, keep your blood to yourself," the participant handbook asks.

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