About three years ago, I got T a cellphone. Last fall the phone died, and I said that as part of the personal guarantee of satisfaction that came with the present I had given him, I’d pay for half the price of the remplacement.

Then I got T an iPod last Christmas, and for my birthday he got me a dog. And the dog promptly ate the iPod earphones, and the iPod charger’s wire.

If it’s T’s gift to me that ate my gift to T, which guarantee applies?