Meaning:
Someone considered to be unreliable can still be right about something on occasion, even if by accident.
Examples:
- Even a broken clock is right twice a day.
- Oh, even a broken clock is right twice a day.
- Even a broken clock is right twice a day.
- Either way, even a broken clock is right twice a day, but this guy...
- Ah, well, even a broken clock is right twice a day, huh?