Poor old Pooh is stuck in the entrance to Rabbit's home. Nothing will budge him, and so he asks anxiously: "How long does getting thin take?" Christopher Robin says "About a week I should think", and so Pooh remains in the rabbit hole, getting thinner and thinner. Meantime,he asks Christopher Robin, "Then would you read a Sustaining Book, such as would help and comfort a Wedged Bear in Great Tightness?" From: 'Winnie-the-Pooh', by A.A. Milne

Of course, this a porcupine pretending to be a rotund little Pooh. Or, as SRW noted, this is a Poohcupine!