Tea is a beverage of planet Earth made from dried leaves, boiled and squirted with milk from a cow. It is favored by Earthlings from the United Kingdom, particularly Arthur Dent, but is considered a delicacy in many other parts of the Milky Way galaxy as well. However, the proliferation of Sirius Cybernetics Corporation Nutri-Matic Drink Machines has made it very hard to get a good cup of tea, as they insist on creating Advanced Tea Substitute instead.
Tea is also a strong Brownian Motion producer. When a Brambleweeny57 sub-meson brain is linked to an atomic vector plotter suspended in a nice hot cup of tea, finite amounts of improbability are produced. This scientific effect was used to manufacture the Infinite Improbability Drive that powers the Starship Heart of Gold.