pipe cutter

helping a friend to re-plumb bathroom. Saturday afternoon. Using his pipe cutter ( a tool no more then 30mm square) I noticed the cutting wheel was damaged and wasn't cutting the copper pipe very well. I promised I'd get a new one for him by Monday (my present to him). Sunday morning my son was playing an away game of football, 35 miles from home. He asked me to go with him. I did. waiting for the game to start he asked me to help him 'warm up' by kicking to ball to-and-fro. We set about doing it but my son insisted on moving where we were, to another part of the park (behind the goal mouth). When my son told me where to stand, I felt something hard under my right shoe. Thinking it was a stone I bent down into the grass, parted the grass and there, the exact same cutter, same colour and brand as my friend's one. scaaaaaarrrrryyyyy