A theory that states that any beverage (I.E. a liquid you drink) that comes packaged in a Green Bottle mixes well with anything else that comes in a Green Bottle.
Examples of things that come in
Green Bottles
Sodas such as Mellow Yellow, Squirt, Sprite,
Mountain Dew, and 7-Up.
Alcoholic beverages the comes in
green bottles such as Heineken, Tanqueray, Midori, Hard Ciders, some Wine, and Jagermeister.
Other things such as NyQuil, some Teas, and other such things