Enemy Mines in theatre.
- Played with in Coriolanus. After the title character is banished from his native Rome, he teams up with his former nemesis Aufidius (and just to be clear, these guys hate each other so much that they've each sworn repeatedly (and graphically) to kill the other) in order to help Aufidius conquer Rome. It doesn't work out for either of them.
- Hamilton: As per history, Hamilton endorses his longtime political foe Thomas Jefferson for President against their common rival Aaron Burr. The show makes a point of hammering home Hamilton's reasons for this — as much as he dislikes Jefferson's ideals, at least Jefferson has ideals.Hamilton: I have never agreed with Jefferson once
We have fought on like seventy-five different fronts
but when all is said and all is done
Jefferson has beliefs — Burr has none.
- Mrs Hawking play series: In Gilded Cages, Mrs. Hawking briefly goes to see Lord Brockton, the blackmailer she ruined in the first play, for information on who might be behind a recent plot. In an interesting take on the trope, Brockton happily shares all he knows not because he wants to help, but because he believes that the person Mrs. Hawking is after will defeat her, and there's nothing he wants more than to see her fall as revenge for her exposing him.
- In Reds and Blues, the two families of feuding Liverpool and Everton supporters (and the audience, who are likely to be similarly split) briefly join together when a Manchester United fan shows up.
- In The Taming of the Shrew, several men are rivals for the hand of the fair Bianca, but her father won't let any of them marry her unless her shrewish older sister, Katarina, is married off first. Realizing that there's no point in fighting each other if they don't have a chance, the suitors decide to work together to get Katarina a husband.