A young mother is rocking her newborn to sleep when suddenly the smell of vinegar fills the air. She quickly pulls the curtain back, and sure enough, the disembodied head of a woman is floating just outside the window, with long, finger-like tendrils slithering out toward her child. In a panic, the mother slams the window shut, just before the apparition reaches her, and breathes a heavy sigh of relief. While folkloric monsters are numerous in Southeast Asia, one flying head soars above the rest: the Malay penanggalan, a vampiric…