Nay, then, thou mock’st me. Thou shalt buy this dear,
If ever I thy face by daylight see:
Now, go thy way. Faintness constraineth me
To measure out my length on this cold bed.
By day’s approach look to be visited.

– William Shakespeare

A Midsummer Night’s Dream, Act 3, Scene 2. When Demetrius hears the voice of Lysander calling him, he promises his love rival that he will pay dearly if he ever sees his face in the daylight. The macho Demetrius, bent on revenge, doesn’t realize that it is Puck mocking him in Lysander’s voice. This is dramatic irony.