A bit of foreign matter in the pipe that floats up to the faucet when you turn it on and lodges there. When you turn off the water the object floats back down away from the faucet.
(One morning on WRKO Radio) The tub's not clean! Let's remodel the bathroom.
(One afternoon on WRKO Radio) It's time for an oil change. I'm going to trade in the car for next year's model.