Charmed - Season 2 Episode 13 -

On Valentine's Day eve, three college mates of Phoebe buy a witchcraft book to cast a spell seeking dates, transforming animals in humans for twenty-four hours. They tape Phoebe's correct spell and transform a serpent, a rabbit and a pig in men. However, they become humans with animal instinct, threatening and killing people. Meanwhile, Prue feels uncomfortable at home without working and Piper is divided between her love for Dan and for Leo.