The script for the “Airline” sketch was simple: Captain Tim Conway needed to announce engine trouble to his terrified passenger, Harvey Korman. But Tim had a different flight plan. Instead of reading his lines, he began mimicking a short-circuiting intercom using nothing but his own throat. Strange static buzzes, high-pitched squeals, and garbled nonsense poured out of him. Harvey, strapped in his seat, wasn’t shaking from the “turbulence”—he was shaking from the sheer agony of holding back a laugh. His eyes watered and his lip quivered as he tried to look scared, but Tim showed no mercy. He saw Harvey cracking, leaned closer to the mic, and delivered one final, unscripted sound that didn’t just break Harvey’s composure, it nearly forced the producers to cut the feed entirely…