Layering mashed avocado and black olives on top of a sweet potato chip creates a creepy, crawling snack. For the full Halloween experience, serve these horror d'oeuvres with a Bloody Fizz cocktail.
Mash avocado; season with salt and lime juice. Mound dollops of avocado mixture on top of sweet-potato chips. Halve olives lengthwise; place 1 olive half, cut-side down, atop each chip. Thinly slice more olives lengthwise to create legs, and place 4 on each side of the olive halves.