The most ironic scene in this play comes in Act III scene 4, which is when Hamlet is with his mother and he hears Polonius shouting, obviously fearing that he is going to visit some harm on Gertrude. Hamlet kills this hidden character thinking he is Claudius, only to discover that it is actually Polonius. Note what he says when he discovers the identity of this person:
Thou wretched, rash, intruding fool, farewell.I took thee for thy better. Take thy fortune.Thou find’st to be too busy is some danger.