Sparkling water. I don't understand how people can drink this stuff. I can quite perfectly understand why people wouldn't want to drink Diet Coke. I happen to like it, though by no means do I happen to think that it's the best-tasting beverage available like so many people think I do. But sparkling water? Why would you do that to yourself?
The stuff is pretty disgustingly popular here. Probably at least half my team drinks it, if not two-thirds. I think that I only met two people in my entire life before coming out here whom I knew drank sparkling water: my grandmother, and one of my mom's coworkers. And that's about what I'd expect, based on the taste: two out of a thousand people can stand the taste of it and somehow force themselves to drink it voluntarily.