This came to my mind while I was walking and observed the following:

A guy was picking his nose with his pinky. He had at least the first section of his pinky up his nose. This was in broad daylight!

What is the etiquette for picking ones nose?

There are many techniques out there...some more discreet than others...

It's a natural thing...i.e. to have dirt trapped in the nosehairs so why shouldn't picking ones nose be a natural act?