Even a Stopped Clock Is Right Twice a Day

“I have two clocks: one doesn’t go at all, and the other loses a minute a day; which would you prefer? ‘The losing one,’ you answer, ‘without a doubt.’ Now observe: the one which loses a minute a day has to lose twelve hours, or seven hundred and twenty minutes, before it is right again: consequently, it is only right once in two years, whereas the other is evidently right as often as the time it points to comes round, which happens twice a day.
Link