about electricity ( or whatever enegy ) misbehaving ..
or accidently used incorecctly.

Murphy's Law ( from the US space program's early days in the design phase I
believe )
states that...

If there is a way for it to screw up, eventually it will.
If there is a way for someone to do something wrong with a system or
device..
eventually someone  WILL.

An example..
a member reported smelling propane in his westy while driving around.
He was driving with the propane tank valve on.
and the large rear table not properly secured.
The table swung around and turned on a gas valve on the stove !!
( talk about dumb design )

very good example..
it's so easy for any designer to say ...'oh, that'll never happen.'
or many vanagon owners might say that over this or that.

( I was going flying with a guy once, He taxied right across the taxi-way
without looking. I said ..
you should look, there could be an airplane landing on that taxi-way. He
said ...'oh, that'll never happen'.
A saying in flying is there are old pilots, and bolt pilots, but no old bold
pilots.
Anything that you can imagine going wrong ..can and will eventually
happen. )

and I won't mention a commuter plane used a Canada a lot where there were
incidents of the nose wheel deploying turned 90 degrees ..so it can't role.
Like to land.
  The final analysis is that it was  'design influenced technician error' .
German built and desinged  aircraft.
there was a way to put it together wrong ...it probaly was 'too precise'
.....'too german' ..
happend a hundred times before they figured it out, on many aircraft of that
type.

so if it CAN happen ..( say something shorts out )
eventually it will for sure, someday , sometime.