Coke vs. Pepsi. It's the perennial brand war and the ultimate taste test. While most of us would admit we have a preference, most would also readily admit that the two thirst quenchers are more similar than different.
Like a Xerox has become a copier, a Jacuzzi a hot tub, and a Post-it a contact management system (well, maybe that one's just me), Coke and Pepsi have become words synonymous with any old cola. Ask for one, and half the time you will get the other. And even if you can detect a slight difference, chances are that you won't decline the beverage entirely. It's close enough.