The Last Hole

Three campers jumping on the ground yelling 49,49,
49...
Another camper walks up an says "What are you doing." One of the other camper says "We are jumping on a man hole.Do you want to try?" "Sure" Says the camper. The camper jumps on a open manhole and says 49 and then falls and the other camper start saying 50,50,
50...