Psychiatrist: That is the strangest case of parking sons disease I have come across so far.
Explanation: This joke centers around a man’s concern about his four sons wanting to become valets, implying a humorous disappointment in their career choices. The psychiatrist’s response introduces a clever play on words with “parking sons disease,” a pun on the phrase “Parkinson’s disease.” The humor lies in the unexpected twist: instead of addressing the man’s depression directly, the psychiatrist focuses on the unusual career aspirations of his sons, suggesting that their choices represent a lighthearted and fictional “disease.”