The Scottish Play and the Bard's play are euphemisms for the William Shakespeare play Macbeth. The first is a reference to the play's Scottish setting, and the second is a reference to Shakespeare's popular nickname. According to a theatrical superstition, called the Scottish curse, speaking the name Macbeth inside a theatre, other than as called for in the script while rehearsing or performing, will cause disaster. On top of the aforementioned alternative titles, some people also refer to the classical tragedy as Mackers for this reason. Variations of the superstition may also forbid quoting lines from the play within a theatre except as part of an actual rehearsal or performance of the play.