Low humor of 'Black Comedy' brings high guffaws

Can we agree that characters who make fools of themselves onstage tend to be funnier when they sound British? Also French. No Rules Theatre Company does that convention much justice in its bumptious revival of Peter Shaffer's 1966 farce "Black Comedy." From the playwright who gave us the high drama of "Equus" and "Amadeus" came also this low-comedy of pratfalls and misbehavior.