Moxie – northern New England. About every five years, I buy one to see if it’s as bad as I remember. It always is.
On the other side of the spectrum – Del’s lemonade in the RI area (with a location on the strip in Vegas) is as good as it gets, with coffee milk in second place (another RI specialty). Warning – don’t ask for a milk shake in RI. There, it’s typically prepared without the ice cream. Locally, it’s a cabinet if it has ice cream, but occasionally called a frappe as well.