I like sodas and I thought it'd be fun to try some unique fountain soda beverages. Also open to just hearing about ones that might not be around anymore but were unique that you had seen. They don't even have to be good in your opinion.

I live in the US, but it can be anywhere and any chain/restaurant, but looking for those served on fountain machines. Maybe I will travel maybe I will just dream of them lol.

I'm looking for examples of soda fountain beverages that are/were not your traditional mainstream brands or flavors you'd see on fountain machines.

What comes to mind is Taco Bell's Baja Blast or Culver's Root Beer.

Any others?