Time is money
As the taxi came to a screeching halt at a traffic light, I asked the driver, "Do you agree that 'Time is money'?"
"Well, it's a very common saying. Who will care so much about that?" the driver answered.
"Look, the digits in the meter are still running when the car has stopped," I pointed at the meter.
"Oh, yes. You've got a point here. In this case, time is money for both of us." added the driver.