So I'm playing a DL game, and am engaged in a war with the Altarians, when the Arceans decide to attack me since I'm at war with one of their friends. Since I'm unable to fight this two-front war, I decide to make a quick peace with the Altarians by stealing one of their planets and then offering it back in exchange for a treaty. All works out, now I'm back to only one opponent, but a couple of turns later, the Altarians contact me and tell me that, since I've surrounded several of their planets with transports, they've decided to take preemptive action against me.
One problem: I don't have any transports left, I had to make one special for that last planet grab. They're going to war with me over weapons that don't even exist! (Actually, this is a good real-life example of the fable of the Wolf and the Lamb. Well, maybe not real-life, but something I'm able to connect with more than a story about a wolf and a lamb.)