I do love Moxie… a friend of my wife’s sent us three 12-packs as a wedding present!
The nastiest, outside of Jones’ deliberately nasty holiday sodas, such as Brussels sprout soda, turkey & gravy, etc, is probably a Butter Scotch Soda that I found some years ago. Perhaps it was Outlaw brand? I kept the bottle for years, but don’t know what happened to it. It was a brown bottle with a paper label showing a cowboy on a horse trotting away from the drinker, probably ashamed that he’d been suckered into selling this stuff. It tasted exactly like melted-down butterscotch candies mixed with club soda.
Dr. Brown’s Cel-Ray is also quite terrible, but spare a thought for Faygo Redpop. I swear that stuff tastes exactly like carbonated Robotussin.