In March of 2012, I played a local municipal course and due to the soggy conditions, holes on the back 9 were flooded. We had to play the front 9 twice to get our 18 in. I had a problem with plugging all day and coming to the ninth hole, I had lost three balls as a result. We weren't putting out because the cups were filled with water.
To make a long story short, I couldn't find my ball after teeing off on the Par-3 9th, uphill green from the tee-box, and figured I plugged it into the side of the embankment. I took the drop and finished the hole. The second time through the course, when playing this same hole, my partner found my original ball in the cup after making a long putt. Only one other group was on the course at the same time as we were...so either they played a cruel joke on me and placed my ball in the cup, or I had a hole-in-one the first time through and was too stupid to check the cup when I thought my ball plugged.