My girfriend and myself had this collie who stayed with us in the house. He had this hard nylabone chew toy that he loved. Once we were making love, and the dog was in the bedroom. I was mounted on my girlfriend, pumping furiously, sweating profusely, when the dog got excited, jumped on the bed, and dropped the cold bone on my naked back! We started laughing, of course, and my hard-on naturally disappeared...but the laughter was great! We soon "continued" our fucking session, but wisely closed the bedroom door, with the collie outside the room. I'll never forget that...laughter can be a great medicine!