I keep a half gallon (I know it is measured in liters and shit now) of Jack Daniels on the shelf for me, at all times.
I also keep a half gallon of Evan Williams in there. It is for guests I don't really care enough about to feed the Jack to. The bottles look similar, especially if you are not paying too much attention. So my in-laws, etc., think they are drinking Jack Black, and I am saving money (I've seen the Evan Williams for as little as $12-$13 a 1-point-seven-five, on sale.)
One night after a few drinks I got a little mixed up, and poured myself some of the Evan W. (I drink my bourbon/whiskey in a large highball glass with ice, about 1/2 bourbon and 1/2 bottled water.) When I realized what I'd done, I thought, "Damn, this Evan Williams isn't all that bad, actually."