This phrase would've been so helpful seven months ago. Alas, this incident happened before I discovered eHell:
DF and I were at his niece's birthday party. I wound up being introduced to some friends of FBIL and FSIL's friends.
Friend: "So, you're his (DF's) boss!"
Me: "Um....nooo, I'm his fiancee."
Friend: "Yeah, his boss!"
Me (trying extremely hard not to be insulted, but failing miserably): "Our relationship is pretty equal, actually."
Friend (condescendingly): "Awwww, that's so cute, she's being nice. That won't last long after the wedding!"
DF and I were both completely flabbergasted by the idea that once we were wed, I'd turn into a controlling harridan who rules the house with an iron fist. I have since learned that this guy is pretty well-convinced that he's the most hilarious comedian ever, and I've even seen his young son rolling his eyes at Dad in the manner of the long-suffering. This was his idea of a clever joke. Go figure.
So. Yeah. "What an interesting assumption," is a wonderful sentence which I shall now treasure. But if only I'd had it in my arsenal then!