CHICAGO — This isn’t meant to be answered with certainty, but for a moment, ask yourself: What is the single best comedy sketch of all time? From any source — Abbot & Costello, Monty Python, “Saturday Night Live,” “Portlandia,” “Chapelle’s Show.” There’s no ruling body on the question, not even a Rolling Stone-esque comedy magazine to claim that authority. But there is a smart married comedy ...