Here's some context...

The quote's from Mostly Harmless, the fifth book in the Hitchhikers Trilogy. Buy here, read online here.

"All mechanical or electrical or quantum-mechanical or hydraulic or even wind, steam or piston-driven devices, are now required 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."

Considering the source, I was surprised and a little disturbed when I noticed this legend didn't seem to be well known in the Singularitarian community.