That thing where your publisher sends you a congrats card for making an award shortlist. And it comes with a gift box full of amazing artisanal macaroons.
Which would be great if not for the fact that (a) I'm diabetic and (b) my spouse is vegan (hint: macaroons contain eggs, which are not vegan) and (c) spouse is also allergic to eggs.
(This is a subset of the "my aunt always sends me a pair of socks she knitted for Christmas, and they don't fit" etiquette problem!)