During training one of the psych patients in the ward used to pick his nose constantly and wipe it on the wall next to his bed. What's wrong with that you might well ask? He was constipated to the point when he coughed he coughed up sh1t. Picking his nose was no different. I used to end up crying laughing when others would see him do this, spot the black brown colour of the "snot" stripe on the wall and on his finger and then run off to puke.