"Вдруг бывает только пук" (suddenly happens only fart) is a colloquial humorous phrase, which is a retort to a person asking "а вдруг?" (what if?). I can't find etymology of this phrase. Where did it come from?

  • 1
    Interestingly, there's phrase Вдруг только кошки рожают (meaning Only kittens happen suddenly).
    – Aleks G
    Mar 26 '14 at 15:48
  • 7
    It's a "toilet" joke based on rhyme. I don't think it has a an etymologically significant source.
    – Artemix
    Mar 26 '14 at 16:27

With Russian being my native language, I came across this phrase only a few times. This, I believe, is an example of typical Russian street-made-up expressions. Answering that to "А вдруг?" would not be very polite, by the way.

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