The Comedy of Errors is one of William Shakespeare's earliest plays. It is his shortest and one of his most farcical comedies, with a major part of the humour coming from slapstick and mistaken identity, in addition to puns and word play. The Comedy of Errors (along with The Tempest) is one of only two of Shakespeare's plays to observe the classical unities. It has been adapted for opera, stage, screen and musical theatre.