Canned laughter, also called a laugh track, is a sound track added to television comedies. Canned laughter is used during areas of the show when one would expect an audience to laugh. It may punctuate jokes or moments of slapstick comedy. Not all television comedies where one hears laughter after jokes use canned laughter. Some shows, notably The Cosby Show recorded episodes in front of a live audience.

The first use of canned laughter was in the 1950s television series, The Hank McCune Show. The canned laughter came from a box invented by Charley Douglass. His sound machine was called the Laff Box and delivered a variety of laughs, from giggles, to chuckles to tear producing laughter. Types of laughter could be played separately, much like playing a sample keyboard.

Today’s canned laughter is more sophisticated since sound technology has advanced so much. It can be inserted virtually anywhere in an episode, and samples of laughs can range dramatically. Early canned laughter often began to sound the same after a while. For example, it’s fairly easy to recognize the same laughs over and again on shows like The Brady Bunch.

Though canned laughter was most often employed on 30-minute sitcoms, sometimes it was used in hour-long shows as well. One unusual use of canned laughter was for the series Eight is Enough, which often was not comic. More often hour-long series like The Love Boat were punctuated with canned laughter that may have helped some laugh along with its watered down comic material.

The idea behind canned laughter is that it provokes the laughter of an at home audience. Laughing can be enjoyably contagious. However, some find the prospect of canned laughter somewhat annoying, as it subliminally attempts to get laughs for comic lines that are relatively undeserving.

Some recent comic television shows have veered away from canned laughter. Shows like My Name is Earl and both the British and American versions of The Office do not employ canned laughter. Some claim they enjoy these shows more because they give one an opportunity to laugh freely, without being influenced by an imaginary audience.

Not all shows that are recorded in front of an audience completely use the audience’s laughter. If a joke does not seem to provoke a large enough response, laugh tracks may be added. This is usually referred to as sweetening the laugh track.