He's trying to make you the butt of a joke mate, it's only taken off the bill if you completely finish everything on your plate. If there's any food left, the value is appraised and taken from your reservation fee. If the difference between this amount and the total bill is estimated to have a lower value than the combined jewellery of everyone at the table, an agreement may be reached whereby you forfeit your valuables in lieu of the money, but the waiting staff are obliged to follow you out of the restaurant grasping and wobbling their genitals.
inb4 "I'm going to..."
