He was out on the beat way back when, early 90's or so, and him and his partner hear a call from dispatch on the radio that a girl who lived alone in a small house converted into two flats was hearing noises from upstairs - which was not occupied and had not been for some years, apparently.
At the time, he and his partner was close by the location of the call, as was a canine unit who got there before they did. The canine unit had this dog called Floyd who was 'famous' for being completely fearless to the point of madness. So they go up the outside stairs of the flat to the door with Floyd and kick the door down and send Floyd in, but as soon as he stepped over the threshold he stopped dead, hackles raised and started whimpering. He tried to go back downstairs but the dog handler 'threw' him into the room where he was just terrified and would not move.
The flat was empty apart from a few boxes and a children's cot, which had a mobile hanging above it (not phone kind, toy kind). The mobile was turned on and moving making musical sounds.
They didn't find anyone or anything else in the house.