I often think of taking things back to shops that I want to keep (especially gifts) and getting with the refund something that I already have and don’t need.
Or when people ask me what I want for my birthday/Christmas, I get an urge to say I would absolutely love something I have no interest in. So that they buy it, expect me to be full of joy, and I would of course give them that impression, but I would be sad inside and probably put the present straight in the charity shop or bin afterwards.