A rather old-timey flavor that I've seen pop up here and there lately is Rock & Rye. I've occasionally seen bottles of it collecting dust on a liquor rack bottom shelf. If you're from Detroit, or a Juggalo (you know who you are), then your more common association is with Faygo's Rock & Rye flavor soda.
This largely forgotten potion goes back to well before Prohibition. Even ardent followers of the temperance movement had a bottle in their medicine cabinet despite the high alcohol content.
But just what is rock and rye?