Why do we tell actors to "break a leg?"......Because every play has a cast!

So I'm a big Shakespeare nerd and I love watching plays in the park. My four favorite plays would Macbeth, Romeo and Juliet, Midsummer's Night Dream, and Comedy of Errors. When I was in fourth grade, I memorized the whole balcony scene (both parts) in Romeo and Juliet and I would recite it all the time. Anyone else have a favorite play?