They keep that in a refrigerated display case. Note that they don't actually use it for anything, not even as a measurement standard; a chocolate teapot is completely useless. That's why you only hear people say, "It's about as much use as a chocolate teapot.", and not, "It's less useful than a chocolate teapot." The second phrase (aside from being impossible) implies that that someone has somehow measured the usefulness of a chocolate teapot and obtained quantative results, which is, again, impossible.