Katie and I were discussing candy the other day (I seem to have this conversation often. What can I say, I love candy).
I contend the absolute WORST candy in the universe is Horehound Drops. Even the name is hiddy. They taste like the world's worst cough drops.
I must have tried them as a child, I'm sure the same pile of drops were in a bin at Meredith's Dime Store for the entire 85 years the store was in business (right next to the super stale Circus Peanuts). I'm still scarred by the taste experience.
That said, my second choice for worst ever is Jujubes. Or Jujyfruits. Gak. Sticky and terrible.