Broken Clock
A: Do you know that between a broken clock and a clock which is slower by 5 minutes.. which one is more useful? B: The clock which is slower by 5 minutes? A: What? Hell no. A broken clock is more useful. B: Huh why? The broken clock cannot tell the time at all eh.. A: A broken clock is right twice in a day, but a clock which is slow is never right.