Claim: Back to the Future Part II is of a genre.

Comedy is a genre of film in which the main emphasis is on humor . These films are designed to make the audience laugh through amusement and most often work by exaggerating characteristics for humorous effect . Films in this style traditionally have a happy ending -LRB- black comedy being an exception -RRB- . One of the oldest genres in film , some of the very first silent movies were comedies , as slapstick comedy often relies on visual depictions , without requiring sound . When sound films became more prevalent during the 1920s , comedy films took another swing , as laughter could result from burlesque situations but also dialogue .   Comedy , compared with other film genres , puts much more focus on individual stars , with many former stand-up comics transitioning to the film industry due to their popularity . While many comic films are lighthearted stories with no intent other than to amuse , others contain political or social commentary -LRB- such as Wag the Dog and Man of the Year -RRB- .