I was in high school playing golf at Old Mill. I hit a wayward shot and found my ball off a hill between two holes. As I was getting ready to hit the ball, another cart drove up and a guy asked me if that was his ball. I said “no, I checked it”. I checked it again and it had a logo on it that wasn’t my ball. Instead of fessing up and telling him that I screwed up, I was too embarrassed so I kept my story. I hit his ball and finished the hole with it. I’m still bummed about my choice to this day.