A group a vampires has variously been called a clutch, brood, coven, pack, or a clan.The Muppet vampire, Count von Count from Sesame Street, is based on actual vampire myth. One way to supposedly deter a vampire is to throw seeds (usually mustard) outside a door or place fishing net outside a window. Vampires are compelled to count the seeds or the holes in the net, delaying them until the sun comes up.A rare disease called porphyria (also called the “vampire” or “Dracula” disease) causes vampire-like symptoms, such as an extreme sensitivity to sunlight and sometimes hairiness. In extreme cases, teeth might be stained reddish brown, and eventually the patient may go mad. Vampire legends may have been based on Vlad of Walachia, also known as Vlad the Impaler (c. 1431-1476). He had a habit of nailing hats to people’s heads, skinning them alive, and impaling them on upright stakes. He also liked to dip bread into the blood of his enemies and eat it. His name, Vlad, means son of the dragon or Dracula, who has been identified as the historical Dracula. Though Vlad the Impaler was murdered in 1476, his tomb is reported empty.