if it's not one thing it's another

Если что-то не пошло не так — значит скорее всего это случится с чем-л. другим.
~не одно так другое.
When John lost his keys and his wallet, and his car wouldn't start, he exclaimed in despair, "If it's not one thing it's another."
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'if it's not one thing it's another' on video