For fans of evolution, Ke$ha is a living example that we derived from the monkeys. Ke$ha was born with a vestigial tail about 1 cm long, which the surgeons had to remove at birth.
Highly uncommon, vestigial tails leave the mothers wondering about the birth father of their babies. Even worse, longer vestigial tails killed a lot of women back in the days when witchcraft was in vogue.
Ke$ha is by no means embarrassed by this genetic abnormality, as she never tried to hide the monstrous detail from her fans and the public. In fact, she even considers herself unlucky for receiving the surgery that cut the little guy off.