I had worked late, and my Labrador was so overjoyed to see me arrive home that he jumped up just as I leaned down. Our heads collided, and I sported an impressive shiner for several weeks.
I had to repeat frequently to co-workers and friends how I came by it, and one day in the lift, a secretary whom I hadn't seen for some time looked at my black eye and exclaimed, "My goodness, what happened to you?"
"The dog did it," I wearily replied.
A man standing next to us looked over at me and said knowingly, "Ahh, you must own a boxer."