This one is from today's game. I am sure it will be one of my all-time classics.
The situation: Elizabeth, Washington, and Ramesses on the continent. Geographically, Washington is in the middle between Lizzy and me. Lizzy founds Confucionism. It speads to me, and I immediately convert. Washington has no religion, but eventually beats me to Theology (by 3 turns -- arg!!) and naturally converts to Christianity. By now, Lizzy and I are pals (she is "pleased" and I have 8+ green and zero red diplomacy marks with her). I check in with her about every turn to see how she feels about ol' George having a contrary religion. She remains "cautious." Meanwhile, George is getting progressively "annoyed" with me. I know a war is coming, so I made a deal with Lizzy to trade my only Stone mine for Ivory, planning an Elephant assault on George. I know that NY City has Stone, so I will get it back via the war. All of going well, I research Construction, get my stables built, and begin making my Elephants. George declares war on me as expected, and after the usual "feeling out" process of sending in his first suicide Horse Archer to see what I have in Memphis, I get a message from Lizzy that she is canceling our Ivory for Stone deal! Not only did she decline to help me in the war, she takes away my key military asset. So, I checked with her to see how she feels about Washington now that he has started a war with her "friend" Ramesses and demanded that she cancel our trade deal...
The punch-line (Lizzy reply to me): "I have a feeling Washington is up to something, but I can't prove it yet."