The opposite is also true. It happens rarely, but I have been bitten by trying to configure something to be what I would like it to be, only to discover it had to be what was in the documentation for it to work, generally with nothing in the documentation itself to clarify.
Can't think of any examples now though I'm afraid.
Completely off topic aside but I read somewhere recently that the reason for this was that black paint dried much faster than any other colour, which meant less time taking up space in the drying room, which meant more production capacity.
So basically it was black because that kept production costs down.
Can't think of any examples now though I'm afraid.