Babcock'd
When someone screws you over so bad you think they're giving you a compliment instead of a beatdown.
My boss said he was giving me a promotion, but it turned out I was just getting more work.
My friend said she'd help me move, but she showed up with a broom and left me with all the boxes.
My ex said she was doing me a favor by breaking up with me, but I was just left with the bill for the restaurant.