"Hoist with his own petard" is a phrase from a speech in William Shakespeare's play Hamlet that has become proverbial. The phrase's meaning is that a bomb-maker is blown ("hoist") off the ground by his own bomb (a "petard" is a small explosive device), and indicates an ironic reversal, or poetic justice. The phrase, and its containing speech, exist in only one of three early printed versions of the play—the second quarto edition—and scholars are divided on whether this is indicative of authorial intent, or a mere artifact of playhouse practicalities.