Comedy Of Errors
This tale of mistaken identity between twins separated at birth wasn't new when Shakespeare got hold of it—he based it on the old Roman comedies of Plautus—and it asks a lot of the audience to believe in the wildly-improbable situations. It begins in Ephesus with a contorted tale from Egeon to the Duke of how he once had twin sons and another set of twin boys as servants to his sons but he was separated from one of each and from his wife by a shipwreck. Of course there is a day when the two estranged boys, now grown up, appear from Syracuse ignorant of their siblings' presence but with identical clothing and names to their alter egos. The two Antipholi and their servants Dromio confuse one another and everyone around them as no one can tell them apart and amazingly they are never seen in the same place until the very end of the play.