Thousands of people took to the streets of San Francisco on Sunday for the annual Bay to Breakers race. A San Francisco tradition since 1912, Bay to Breakers is famous for the outlandish costumers — or lack of — worn by race participants.

What do inflatable rubber ducks, tipsy popes and a space-bound Katy Perry all have in common? They were among the flashiest costumes at Sunday's Bay to Breakers, a 12K and 15K race stretching all the way from downtown San Francisco to where the ocean meets the Great Highway.