Unicorns, vegetables and Wonder Woman took to the streets Sunday, along with tens of thousands of other runners as part of the 107th annual Bay to Breakers race. Organizers say 40,000 people registered for this year's race and approximately 150,000 showed up to cheer them on.
Sunday's event kicked off in downtown San Francisco, near the Bay Bridge, with a route that took participants from the bay to the ocean. It's like a track meet on Halloween, with racers wearing running shoes and extravagant costumes.
But vivid attire wasn't always part of the race.
The first Bay to Breakers was held in 1912, in response to the 1906 earthquake in San Francisco. The city was still recovering and needed a morale boost. Some say the very first costume was a comic book pirate named Captain Kidd sometime in the 1940s, progressing from there to superheroes, centipedes and salmon that run upstream from the breakers to the bay.
Today's winners were Philemon Cheboi and Jane Kibii, with the Aggies Running Club coming in first in the centipede division.
Here are some more photos from Sunday's race: