101 Dalmatians. I read the first one so often it practically fell to bits, so had to get another.
A random novel that DH bought me for Christmas two years running (no idea how he managed that, and I can't even remember what it was). I never let on, and I didn't like it all that much the first time. Both are long gone to the charity shop.
A book about bonsai - the second of which I found at a car boot sale, and is signed by the author.