Following Marc Antony turning Rome against the conspirators, a crowd falls upon Cinna the poet, who has the bad luck of sharing a name with one of the conspirators. When he identifies himself, they shout for his death.
Cinnna: I am Cinna the poet! I am Cinna the poet!
Rioters: Tear him for his bad verses! Tear him for his bad verses!
Act IV, Scene I: When Lepidus, a "slight, unmeritable" member of the Triumvirate according to Antony, leaves on an errand, Antony tells Octavius that it's probably best to have him be the errand-running workhorse of the three, to be "either led or driven, as we point the way." Octavius says that Antony may do as he wishes, "but he's a tried and valiant soldier." "So is my horse, Octavius," Antony retorts.
In a very sadistic and dark way, Antony's speech at Caeser's funeral, and pretty much every time he says "And Brutus is a honorable man" cracked me up.