Sprite fresh from the fountain hits you like a brick.
it was an onion coated in caramel instead of an apple.
https://www.youtube.com/watch?v=jV4lWEVlthc
In my experience, fountain soda is watery, nearly flat syrup without fail. Now drinking from a bottle of carbonated water as soon as you open it so that that the carbon scorches your sinuses, that's a brick.