Challenge accepted @DerekOlsen.
Many years ago my brother gave me a really bad paperback book for my birthday. I couldn't finish it, it was that bad.
So for his birthday I wrapped it up and gave it back to him.
He returned the favour that Christmas.
This has been going on, backwards and forwards, for nearly 20 years now.
I found out recently that he didn't even buy the book to begin with, he found it left behind on the bus.