I've heard a similar one. The answer to that was also, coffin, but I said manure.
It was something like, "You don't want it. When you buy it, you don't use it. The user doesn't see it." It was something like that. Everyone laughed when I said manure, but I showed them by proving my correctness.
EDIT 2: Stabby's answer doesn't work, since it asks for an object and a policy doesn't count as an object, or so I think.