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I wouldn't call this irony, but it is amusing.

Julius Caesar, Crassus and Pompey made up the 1st triumvirate. Crassus died invading Mesopotamia. Caesar was planning on invading.

After Crassus died, Pompey & JC had a falling out. Pompey, long detested as flaunting the republic was now hailed by the Senate as the protector of the Republic.

During all that was leading up to the final fight between JC & Pompey, supporters of Caesar burned down the Senate house. As such, the Senate was meeting in a nearby building built by Pompey, that had a statue of him. On March 15th; when the Senate ambushed JC- he died at the feet of Pompey's statue.

But perhaps you mean the play, in which case- you ought to ask under the literature rather than the history section.

Julius Caesar could be very ironic or witty. During a debate an important senator wanted to forbid Caesar hiring 325 pairs of gladiators to celebrate his father's funeral. That was, of course, an excellent way to curry favor amongst the plebs and the main reaons for this senator (Catulus) to oppose him. He said so many gladiators was not undermining the state but a direct assault on it.

Caesar replied to the senate: I have undermined many gates and assaulted all of them with my battering ram. But always one with the other. Then he talked in his tunic:"is that true, oh battering ram?" He looked sweetly to Catulus: "yes, he says it is true."

On which the whole senate minus Catulus fell on the floor with laughter.