LOL!!! I love it! I say Soda. I grew up in the Midwest, then lived in Colorado, now Phoenix - so you'd think I'd say "OTHER".
BUT, I'm SO confused by the South! If I ordered a "Coke" - what in creation does that mean? Because, Coke is a specific flavor, you know?
So, would it be thus: "Yes, um, I'm going to have a Coke, but not a Coke - I'd actually like a Diet Sprite Coke" - I'm so confused.