If we were writing these instructions, we would write "Do not attempt to install if drunk, pregnant, or both." This is because we have, of late, become fans of the serial comma.
Long ago, when we worked for a newspaper (remember those?), we were told never to use a comma before the third element in a simple sequence. As we argue in our book, however, it can make writing a bit more clear if it's consistently included.
Anyhoo, we're really only posting this here and going on at length because it's April 1. This has to be a joke, right?
Thanks to Lance for the submission.