He was convinced to spend the night in a reputed haunted house. He did and noticed nothing out of the ordinary. It was a boring and lonely night for him. He left in the morning to find Smith and collect his bet money.
But then Smith brought him back to the location of the house. Nothing was there. Rodney learned the house was a ghost which appeared once a year. Rodney payed the money and changed his mind about ghosts. But got a new habit of waiting for the house to reappear, year after year.