[massysett]

The old quip here:

Doctor: "if you multiply the cost of your cigarettes by your consumption, you'd have enough money to buy a Ferrari."

Smoker: "do you smoke?"

Doctor: "No."

Smoker: "Then where's your Ferrari?"

[cadamsau]

Doctor: "I used the money to buy things with greater utility than a Ferrari."

¯\_(ツ)_/¯