An example of situational irony in the play "Julius Caesar" occurs in Act 3, Scene 1 when Caesar proclaims that he is "constant like the North Star" shortly before he is killed by the Senators. Situational irony occurs when an outcome is considerably different from what was expected.
In this example, Caesar himself is a victim of situational irony because he implies, with his comparison to the North Star, that he is unmoving, constant and immortal. In the end, however, the Senators prove that this is not true. Situational irony follows Caesar's death in the play as well. The Senators hope to rid Rome of the name of Caesar by killing him, but by the end of the play, the name Caesar has transformed into a title for all the following rulers of Rome.