OK, I brought this on myself intentionally, but it was kinda fun...
My boss is fond of mocking me for being, as he says, "cheap" because I do things like bring my lunch from home and bike or bus to work. Also, on the rare occasions when we do go out as a group (like to take an intern out or something), he'll pay with his credit card and we're expected to pay him back, and I expect him to give me back the change I'm owed. This makes me "cheap" even though he earns far more than I do.
Anyway, the other day after one of these lunches he stopped at the bank to get a $100 bill to give his nephew for graduation. I knew this was probably a bad idea, but I couldn't resist: I needled him by saying, "$100? That's all? I just gave my niece $500 for her graduation."***
So my boss actually calls in another coworker to berate me to her: "Can you believe Lizzie gave her niece $500 for graduation? What a faker, she's always pretending to be so frugal, bringing in her lunch blah blah blah, but she's richer than any of us!"
I said, "You know, you might want to consider that those things are actually related."
The look on his face: priceless.
***This might seem excessive, but I had my reasons, such as that I enjoy spoiling my niece because she's a sweetheart who's had a rough life and besides she can really use it.