Put receipts in with presents you give.

Why do we think everyone should be perfectly fucking telepathic at Christmas? Of course we’re going to give and receive things that aren’t really wanted. How were you to know they got that book from the library last week? So here’s a simple way to make things better: Get an envelope, put the receipt in it, seal it, and write on it “This is the receipt. If this isn’t as good as it could be, for any reason, please change it! Happy 2011! x”

There, problems solved.