Coca-Cola Blak
Was kind of a coffee-infused cola. Had a hell of a caffeine kick too. Many people didn't like it (hence it's disappearance), but I liked it a lot. I still have one bottle I'm hoarding.
Also "Big Wheels"
Yes, I know they still exists as "King Dons" or "Ding Dongs" (depending where you live), but I just can't put something in my mouth that is shilled by a cartoon guy named "King Dong."
How about Zarex?
This was big in the Boston suburbs in the 70s, don't know if it was popular anywhere else. It was a liquid concentrate, you mixed it with water to make "juice". It was mostly corn syrup and artificial flavor.