When I go home for Christmas, I always take along a gift for Goldie, the family dog. This year, instead of the usual rawhide chew bone, I took the dog a "barking bone". Shaped like a bone, the device emits a barking noise when moved. Goldie instantly hated the gift, refusing to touch it; she'd walk away from me if I approached with it. I thought I might be approaching the gift-giving analog of zero degrees Kelvin, so I devised a simple experiment with a leftover breakfast sausage patty. I placed the patty on the floor and put the detested "barking bone" on top of it. Goldie sniffed excitedly right up to the pile, but would not move the bone to get at the sausage underneath.
(From the "Rest" of RHF)