Halloween // I need some good spooky riddles

I will be telling these around a campfire in the woods with mostly 18-24 year olds. They need to be difficult and spooky. Some non-spooky ones I like are the penguins sure does riddle, 2 men dead in a cabin, how many cows?, Jonny Jonny etc.. Ideally more complex than something like “when is a black cat bad luck?” ”when you’re a mouse”