In this week's Parshas Zachor haforah, we learn about Shaul being given instructions to kill out all of Amalek, even the oxen and sheep. On that Passuk, Rashi seems to be saying that the Amalekim had the ability to be Animagi, or actually use magic to turn themselves into animals to hide, hence the need to kill the animals to complete the mitzvah. Huh, and I though Harry Potter was just a fun fantasy book...
