When you're saying one thing, and then someone cuts you off and says that you were actually saying something else because you didn't get to finish your point.
Bonus if they cut you off, then you get a chance to say what you actually meant but they ignore it and keep arguing about what they...
Interior designers do this too. You're looking at it the "right way" the whole time you're working, looking at a mirrored image is like walking into the room for the first time.