DH had a friend over and his younger brother. Popsie is used to DH's friend but really doesn't know DH's brother that well. His friend pulled out my acoustic gutair to play it and when he left didn't put it away. So I just got home from my Moms and noticed the gutair case was wet. I sniffed it and it smells like cat pee. Why would he pee on it? The only think I can think is that there was someone in the house that he doesn't know.