It’ll be 4 seconds slow in the afternoon, which is to say it’s gone back for seconds.
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Edited to make the tense consistent
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I prefer the punch line “when it goes back four seconds”
Yeah, that one is good.
Time is an illusion, lunchtime doubly so.
I’d personally go with:
“Why was the clock slow in the afternoon?”
“Because it went back four seconds at lunch.”
Ooh, that is well put