A visiting stranger makes a keen observation: "Your town is troubled with unruly boys." The trouble is, he ends up being one of the unruly boys, and that's the fun of Shakespeare's The Comedy of Errors, a masterfully chaotic comedy now at California Shakespeare Theater's Bruns Amphitheater.

As farces go, this Comedy requires us to believe that two sets of not-so-bright twins with the same names – the upper-class set is called Antipholus, the slave set is called Dromio – cause confusion, consternation and furious frustration when roaming the streets of Ephesus of the same day. Once over that hump (and Shakespeare makes it pretty easy), the farce clicks along like a finely tuned laugh machine until brothers are reunited, a father's search is fulfilled and a courtesan gets her diamond ring back.

Director Aaron Posner strikes the right tone from the start...