Label your terrifying themed display in your home, office, yard, vehicle, or any room with a not so welcome sign that warns guests, trick or treaters, neighbors, and especially door to door salespersons, they might just become part of an experiment. A sign that reads "LABORATORY" on a cracked, aged stone looking , oval, foam plaque that includes a cable to hang with invites any who approach to please, come on in, join the party.....HAHAHAHAHAAA! Measures 19 x 5.