What word names a sneaker and is also slang for a private investigator?

A small town is invaded by blood-drinking aliens who look like clowns in which 1988 cult film? What is a glowing, smoldering remnant in a dying fire called? What are snails and slugs examples of? A snake and an experimental art movement founded in 1948 share which name? What is a snide, self-satisfied smile called? Which of Snow White's seven dwarfs has a seven-letter name starting with B? Which of Snow White's dwarfs has a name that also refers to a healer? Which leader reportedly said in 1965, "Let's cool it, brothers," just before he was shot?