Carly DiFulvio Allen had just made her big break on Broadway when she discovered something shocking at her desk: A dead body. It took a few seconds before she realized that it wasn’t an actual human corpse, but rather a prop from “The 39 Steps” at the Roundabout Theatre in New York City, the play for which DiFulvio Allen was serving as company manager. In the show’s climax, a dummy is tossed from some height onto the stage.