“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”
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Douglas Adams 317
English writer and humorist 1952–2001Related quotes

Caen, Herb. Herb Caen's San Francisco, 1976-1991, page 159. Chronicle Books, 1992. ISBN
Attributed

“The things that go wrong often make the best memories.”
Source: The Happiness Project: Or Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun

“A wrong that cannot be repaired must be transcended.”
Source: Earthsea Books, Tehanu (1990), Chapter 8, "Hawks"
“When we hope, we usually hope for the wrong thing.”
Source: Brother Odd