Why has nobody thought to carbonate coffee yet? Right after typing the question out, I Googled it. (Are we to a point yet where "googled it" can be lower case? It feels so proper noun like I'm speaking of the Lord. Him. Hm. Unless we're meant to worship the Google. Yes, that must be it. I not only will keep the capitalization, but spread the word that praise for the omnipotent Google is demanded of us all.) And I'll be a monkey's uncle if someone didn't already beat me to the punch.
Yes, there are already carbonated coffee beverages. I don't think it's much of a stretch of the imagination to understand why it hasn't exactly taken off yet.
That said, I feel there's been a push for iced coffee within the last year or two. Five years ago it was the iced chai. Now, we're returning to our caffeinated roots and bringing it all back home to iced coffee.
I don't give a rat's ass about iced coffee. I think it's bullshit. I don't need my diluted bean water to be any more diluted. Perhaps if it were only just recently shaken, I could be convinced. But even then, given the choice, I'd want it bold, steaming and burning my mouth on contact.
In my mouth.