Why 'sheep'? An aged man in Maine is sent to a shrink for evaluation, as his children and grandchildren think he's loosing his marbles. At the Doctor's office, the shrink asks a simple question. "You have 100 sheep in a fenced enclosure; the gate was left open and one sheep leaves. How many are left?"
The old Mainer replies "None! The doc says, "You must not get the math; you have 98 left." The old man replies," Mister, you don't know nothing about sheep. If you leave the gate open, and one leaves....they ALL LEAVE!"