Eyewitness: Hamlet injured in duel.

You've probably already heard of this palpable hit, but just in case ...

Conor Madden -- who plays Hamlet in the Second Age Theatre production -- was duelling with Aonghus Og McAnally, who plays Laertes, when he was accidentally struck in the face with a round-tip sword.

The blade sliced open the flesh underneath his eye socket and the actor collapsed on the stage.

Initially, some in the audience thought the facial injury to Hamlet and the actor's moans were part of the production.

Given the ferocity with which some of the final duels can be played, it's surprising that there aren't more injuries. Thankfully Madden wasn't injured too severely and left hospital with a couple of stitches.