I like the outside eating rule. I used to go bonkers with husband because for years he would keep answering when Wiz was in the circular argument thing. I finally told husband he could either stop contributing to the problem or he could share a room wtih Wiz because I wanted an adult for a spouse, not a child who argued just to argue. Oddly, husband seemed to honestly think he was reasoning with Wiz and that by the end Wiz was accepting what husband said. Except while husband is a quick thinker, Wiz was faster and husband doesn't have many manipulative bones in his body, where all of Wiz' bones are manipulative. So their circular garbage usually ended with husband agreeing to at least most of whatever it was, and then I would step in and say "no. Not this time. Not next time. not ever. " and walk away. At one point husband agreed to spend several hundred dollars for some online thing that wiz wanted. Wiz not only hadn't earned it, it was mostly porn and in NO way okay for my fourteen yo child. But husband didn't even look at it before the argument, and for a while husband thought I was being "mean" by not allowing him to let Wiz have it. The fact that we couldn't afford it didn't matter to EITHER of them, grrrrrrr.
Once husband saw what it really was? He blushed scarlet (he rarely blushes but this was truly hardcore and bizarre) and told Wiz that from then on, it didn't matter what Wiz bamboozled him with, if I didn't approve it wasn't happening.