Purported as putting "the hilarity back into charity", the Cupid's Undie Run tells hopefuls to leave their Sunday best at home and don nothing but their underwear.
Participants raise money for the Children's Tumour Foundation of Australia, an organisation dedicated to fighting neurofibromatosis, a genetic disorder which can cause deafness, blindness, cancer, and chronic pain. Runners are rewarded for their good deeds with prizes, post-race entertainment, drinks, and awards.