I have one you should love. And by that I mean hate.

Over a decade ago I was installing some equipment I designed, training the operators, etc. There were electrical and software components to the system, and it was used to test products coming out of final assembly.

The very first thing that happened was the operator taking the stapled-together stack of detailed instructions I gave them, dropping it on the work bench, and using it as a mouse pad to start aimlessly clicking around.