Ah, the joy of watching theater fail. The looming possibility of malfunction is part of what makes live performance exciting, and disasters remind us of that; the rite requires sacrifice. There is more than schadenfreude involved when we giggle at, say, a YouTube video of a high-school Peter Pan crashing haplessly into the scenery. There is also sympathy—there but for the grace of deus ex machina go we all—and, often, a respect for the efforts of the actors to somehow muddle through. Mischief Theatre’s The Play That Goes Wrong takes this experience to farcical extremes, as six amateur British actors (and two crew members who get pressed into service onstage) try to perform a hackneyed whodunnit amid challenges that escalate from minor mishaps (stuck doors, missed cues) to bona fide medical emergencies and massive structural calamities.