The lawyer's son, eager to follow in his father's footsteps, excelled in law school and graduated with honors. He then returned home to join his father's firm.
At the end of his first day, he rushed into his father's office, exclaiming, "Father! In just one day, I solved the Smith case that you've been working on for so long!"
His father yelled in dismay, "What?! We've been living on the retainer for that case for ten years!"