A father came home from work tired and irritated to find his young son waiting for him. The son asked how much money the father makes per hour. Angrily, the father told the son $20 per hour. The son then asked to borrow $10, angering the father further. Later, the father realized he was too hard on his son. He gave the son the $10. The son revealed he already had money and now had $20 total. He asked to buy one hour of his father's time to have dinner together the next day.