Sherali's Law

In the event a drink or drinks are left at a hosts house for longer than three moons, it is expected the host inherits ownership of the liquor and shan't be returned to the guest upon next arrival.

"Lachie has left his half drunk bottle of Bundy here from last weekend, do you think he'd mind if I poured one?"
"Go for it mate. He knows Sherali's Law."