For the better part of two decades, the laughter of the United States lived inside a padlocked box. Charles Rolland Douglass, a CBS sound engineer who had spent the war helping the Navy develop shipboard radar, built the device in the early 1950s and guarded it the way a sexton guards a reliquary. The laff box, as he called it, stood a little over two feet tall and worked like an organ: keys for titters, chortles, belly laughs, shrieks, a foot pedal to let a wave of mirth swell, crest, and die on command. Douglass wheeled it from studio to studio himself. Clients heard the output and never saw the mechanism. Only his immediate family knew what the inside looked like, and when he finally stepped back from the work, his sons carried the trade forward like a guild secret. The industry word for what he did was sweetening, which tells you the industry understood the product. Sugar is what you add when the thing itself goes down easier disguised.

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