and her hair spilled out like root beerTom Waits, Burma Shave
I get my fix, when I'm fixin', from a supermarket in London's Chinatown. Wholefoods also has a nice one, don't remember what it's called.
My nominee for best root beer can:

Lovingly transported from Austin TX in the belly of a Boeing 777 some years back. Slightly nervous about pressurization, I only brought one over in my checked-in luggage. Of course there were far too many volatile fluid ounces for it to be allowed in my carry-on, even though the thought of such a beverage being used as a cover for terrorist activities is beyond the pale.
Most blah:

Nice try guys, but no cigar. Not even close.
Dr Pepper was mentioned upthread. Last time I was in the States I took a sip down memory lane and practically gagged, for some reason. Used to love the stuff.
Am currently off sugary drinks….