I was returning a computer to our language lab last week, fresh from having one of its fans replaced, when I was informed of a new problem by one of the languages teachers. One the of the computers was “not working”.
I quickly discovered the root cause. It was turned off.
“Oh, trust the boys to not have thought of that!” came the bemused reply from the teacher.
Ignoring the fact that she had herself failed to think of it, I pointed out that the students almost certainly did think of that, but if they had tried turning it on they would not have been able to avoid work by pretending the computer was broken.