But even a broken clock is right at least two times a day

from Jay Z (Ft. Lenny Kravitz) – Guns & Roses Lyrics on Rap Genius

Meaning

If a clock is broken, it will be stuck on whatever time it was when it stopped. Let’s say it was 4:20 (why not, right?) when the clock stopped working. Everyday, at 4:20 in the morning and 4:20 in the afternoon, the clock will be displaying the correct time. Thus, it is right two times a day, even though it’s broken.

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