An inspecting Brigadier decides to visit the psychiatric ward of an army hospital. He wants to show an interest in the unit and asks the nurse how they decide if a soldier needs to be admitted as a patient or just seen in out patients. "Well," says the QA psychiatric nurse, "we fill the bath with water and give the squaddie a mess tin and a spoon. He or she is then asked to empty the bath." "Ah I see!" exclaims the Brigadier, "A normal person would use the mess tin because it is larger and will take less time to empty the bath." "No Sir" sighs the psychiatric nurse, "A sane person would pull the bath plug. I'll get your bed ready Sir!"