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general::
Phrase(s): The unexpected always happens.
Prov. The things you do not foresee will happen to you; when you plan, you cannot think of everything that might happen. • It took us an hour to drive to the restaurant, and when we got there, it was closed. I would never have expected a restaurant to be closed on a Friday night, but the unexpected always happens. Especially to me.
McGrawhill's American Idioms And Phrasal Verbs