I had a minor plumbing repair to do in our bathroom under the sink and within the vanity. For part of the operation I needed a second pair of hands so I enlisted my wife, the esteemed Señora Robin. She came into the bathroom and sees tools scattered around, the contents of the vanity stacked untidily in a corner, and me with my head stuck under the sink.
With barely a pause as she walks in she says, “You cannot possibly know what you are doing.”
This brings me out of the depths of my plumbing cave with a quizzical look on my ruggedly handsome face.
She continues, “I see no butt crack. It is a job requirement.”
I worked for some plumbers one summer in college. They told me there were only three things that I really must know: water does not run up hill; you get paid on Friday; and never chew your nails after a job. Apparently there are four.