When I was yobger, my dad would knock on door when all of us would take showers, and say, "You wasting the water!", only he could take showers. He is notoriously "cheap"/frugal.
If he is cheated 5 cents on groceries, he will drive back up to the store, receipt in hand, and get his five cents---even if it meant he spent more than 5 cents in gas...
He drives to five diff grocery stores to get deals.
And he keeps cars for the longest time (I've learned from him), does almost all mechanical stuff for the cars.
One car he had, he only got one coat of paint on it (he didn't want to pay for anymore), and eventually the paint wore off.