"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. "
— Douglas Adams, British author (Hitchhiker's Guide to the Galaxy)
And here I shall put in another plug for Duotrope's Digest. The above quote is the Duotrope error message (when something occasionally does not click through the way it should). Any website with such careful attention to detail is certainly worth your visit.
When things go wrong, what do you usually cite? Murphy? Bad Hair? Karma? Being human? Write an error message you can use the next time you malfunction.