The laugh track was a staple of mid twentieth century television comedy, with producers sweetening sitcom scenes using recordings of real or staged audience reactions. As the technique fell out of fashion on TV, the sound found a second life online, where creators use it ironically to crown jokes, fails and awkward moments. Short clips circulate on soundboards and meme pages, and the exaggerated, slightly dated feel is exactly the point: it signals that something is supposed to be funny, whether or not it actually is.