People believe that Macbeth is a cursed play due to a growing list of accidents, injuries, and closings connected with the play. Thing is, there's a lot of combat in Macbeth, so there's an increased chance of possibilites of injury, some even fatal.

This is from my fiancee, who has a theater degree and is a Shakespearian herself.

Personally, I love Macbeth, and I have never had a problem saying it backstage for any reason.