Toughy alway loved to "pop" glass ornaments. Grab them off the tree , bite them until the explode with a little poooff in his mouth. He would jump, then go get another one. Never bothered any other ornaments. But he may of had a 'make you jump" fetish. When some one new was petting him he liked to let out unexpectantly with his big boy bark which general caused the petter to jump startled. He would do this every time that person pet him until final they got use to it and did not jump. All that had to happen was for the person not to jump one time and he stop the behavior. I had relatives that new him for 11 years and this fetish of his but still could not stop being startled every time he barked.