At this year's Met Gala, an uninvited guest was the talk of the town — and this guest just so happened to be a cockroach. The insect sparked countless memes and reactions after it appeared on the red carpet, and a roach Halloween costume is sure to provoke some laughs as well as a few shivers. For this costume, you'll want to wear all brown as well as a headband with antennae; a few cardboard cutouts attached to your back can serve as this glamorous roach's extra limbs.