Krayt Dragons were native to Tatooine, and the alpha predator in the Dune Sea. Hooded elderly men were easily mistaken for Krayt Dragons. The Krayt Dragon howl sounds amazingly like a police siren and is good for scattering Sand Poeple who mug innocent travelers and strip their speeders. And you thought Lucas' thinly veiled stereotypes started in The Phantom Menace.
Krayt Dragons are known as the assholes of the desert.