Slapstick is a style of humor involving exaggerated physical activity which exceeds the boundaries of normal physical comedy. The term arises from a device developed during the broad, physical comedy style known as Commedia dell'arte in 16th Century Italy. The 'slap stick' consists of two thin slats of wood made from splitting a single long stick, which make a 'slap' when striking another actor, with little force needed to make a loud - and comical - sound.
The name "slapstick" originates from the Italian language word batacchio or bataccio — called the "slap stick" in English — a club-like object composed of two wooden slats used in commedia dell'arte. When struck, the batacchio produces a loud smacking noise, though little force transfers from the object to the person being struck. Actors may thus hit one another repeatedly with great audible effect while causing very little actual physical damage. Along with the inflatable bladder (of which the whoopee cushion is a modern variant), it was among the earliest special effects.
Slapstick comedy's history is measured in centuries. Shakespeare incorporated many chase scenes and beatings into his comedies, such as in his play The Comedy of Errors. In early 19th century England, pantomime acquired its present form which includes slapstick comedy, while comedy routines also featured heavily in British music hall theatre which became popular in the 1850s. British comedians who honed their skills at pantomime and music hall sketches include Charlie Chaplin, Stan Laurel, George Formby and Dan Leno. The influential English music hall comedian and theatre impresario Fred Karno developed a form of sketch comedy without dialogue in the 1890s, and Chaplin and Laurel were among the young comedians who worked for him as part of "Fred Karno's Army". American producer Hal Roach described Fred Karno as "not only a genius, he is the man who originated slapstick comedy. We in Hollywood owe much to him."