Procne

Procne, from a myth in Ovid's Metamorphoses. Tereus, Procne's husband falls in love with her sister, Philomela, rapes her, and then cuts off her tongue. Then, to get revenge, Procne and Philomela cut off Procne's son Itys' head, and serve his body to Tereus as dinner. And then they all turn into birds.

Greek mythology...sorta disturbing.