Stopped clock

From RationalWiki

The "stopped clock" argument refers to the fact that "even a stopped clock gives the right time twice a day." Someone, even a crank, denialist, or a conspiracy theorist can be correct once in a while by chance alone.

The term refers to an analogue clock with the standard twelve-hour dial face. "Flip digital" clocks (where the numbers are affixed to small plastic cards that "flip" into position when driven by an electric clock mechanism) can also be considered to be "right" twice a day. Such a clock set up for 24-hour time would still be right once a day. Clocks with LED or LCD displays that are stopped are always wrong because they go blank, falsely implying that it is no longer a time.