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expect the unexpected

Be prepared to face unanticipated events or situations. Climbing a mountain has many dangers, so no matter how much you prepare, expect the unexpected.
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the unexpected always happens

No matter what you prepare for or think will happen, it is always that which you had no way of anticipating that will end up occurring. Back when I was 18 and just about to start college, I would have never guessed that I would end up raising a family in rural Mongolia. Well, the unexpected always happens, doesn't it? Don't get too stressed trying to plan for all the eventualities, Tom. The unexpected always happens, so just try to put yourself in the position where you can best deal with it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Earlier this week its policy and resources committee decided to bank PS2m, which was generated through an unexpected boost in business rates calculations, to help fund one-off payments to help the council remain financially stable.
Yesterday, its policy and resources committee decided to bank PS2m, which was generated through an unexpected boost in business rates calculations, to help fund one-off payments that help the council remain financially stable.
" Filipinos also like and do the unexpected, that's why they're unique, added Cevallos, who has been with Swatch for 36 years now.
Cary, NC, April 17, 2019 --(PR.com)-- Unexpected, a non-profit organization based in Raleigh-Durham, North Carolina, with a core mission to provide support services for young, first time mothers, is hosting its first free Mom & Me Networking Event on May 4, 2019 from 2-4pm at the Herbert C.
Roald Dahl's Tales Of The Unexpected attracted them all and offered viewers half an hour each week of sinister, weird and quirky stories with a macabre twist.
Manila Water has apologized for unexpected water service interruption in some areas in Metro Manila from Thursday night to Friday morning (March 7 and 9).
Critique: An inherently engaging, impressively original, and exceptionally well written novel, "The Unexpected" by C.
Nearly 53% of Bulgarians could not cope with unexpected financial costs last year, according to Eurostat's analysis of the share of people in the EU who faced unexpected financial problems in 2017.
There's a married couple, a pilot, the oldest Unexpected Star at 92 years old and the youngest at 11 years old.
All the Unexpected Stars have been incredibly shocked but have brought the house down with their amazing performances at the end of each show.
"I would imagine that to the seniors that know who I am that it is entirely unexpected that I would be standing here giving a speech," Scott said.
"Grace for the Unexpected Journey: A 60-Day Devotional for Alzheimer's and Other Dementia Caregivers" was specifically written by Deborah Barr for anyone who is a caregiver to someone with Alzheimer's or any another type of dementia.
Among serious incidents at the Heart of England trust in 2016/17 were four unexpected neonatal deaths, as well as two unexpected maternal deaths, including one postnatal death.