Sam's neighbour was annoyed by Sam mowing his lawn early in the morning. When Sam's neighbour sent Sam a bottle of oil in response, Sam sent it back with a note telling his neighbour to use it on his wife when she sang late at night. A few days later, when Sam's wife was coughing, the neighbour returned the bottle with a note saying it was good medicine for her cough. This exchange shows that petty insults between neighbours will likely escalate the situation.