It was, of course, as a result of the Great Ventilation and Telephone Riots of SrDt 3454, that all mechanical or electrical or quantum-mechanical or hydraulic or even wind, steam or piston-driven devices, are now requited to have a certain legend emblazoned on them somewhere. It doesn't matter how small the object is, the designers of the object have got to find a way of squeezing the legend in somewhere, because it is their attention which is being drawn to it rather than necessarily that of the user's.
The legend is this:
`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.'
mostly harmless, 1992