The actual law is:
You tend to take more notice of things going wrong,
and particularly when they do so at inopportune times.
Nonetheless, people routinely do not plan, test or
maintain for worst-case scenarios, with the result
that when stress arrives, stuff breaks.
Back when computers were unreliable, I used to schedule
the periodic preventative maintenance for Thursday, so
the tech could come back on Friday and fix what he broke.
Do you back up your PC?
Have you ever actually done a restore?
If not, assume your "backups" are nothing of the sort.
You tend to take more notice of things going wrong,
and particularly when they do so at inopportune times.
(snip)
Back when computers were unreliable, I used to schedule the periodic preventative maintenance for Thursday, so the tech could come back on Friday and fix what he broke.
Two points: Some dead-and-gone humorist suggested that
with the original Pentium (and follow-ons), Intel and
Microsoft collaborated on special circuits and software
inside PC chips to time breakdowns to increase in response
to a user's urgency, as indicated by such factors as
moisture on fingertips, frequency of backspaces (type-
overs), and so on.
And if you don't believe that legend, there's always
the Sodding Paper ClipTM to deal with.
Remember, computer operators are in the luckiest profession...
because everyone knows, computers go down on you just when you need them the most! (grin)