Mike Sterling posted a scan of the cover of Superboy #189. His comments were more about the comics atmosphere at the time that brought about the cover story, while mine are more personal.
About a couple of years after it was published, after years of hoping and dreaming, our family finally was going down to Orlando Florida to go to Disney World. Fortunately, my Aunt Bertina lived down there with her family, which included cousin Steve Gray (or Stevie Gray, hoping he finds it via a Google Search) who had some comics, one of them was this very issue.
Not being much for the horror genre at the time, the story was nonetheless entralling. It dealt with a Kent ancestor who sentenced a man for stealing a loaf of bread for his starving family until he was "dead...DEAD...DEAD!!!" (that part sticks in my mind) who had a curse placed on him by the man before hung of him and every Kent ancestor being killed by hanging every 50 years. And as with stories of that nature, freak hanging accidents plague the male Kent ancestors every 50 years. Guess what anniversary it is in the story? The rest of the story deals with keeping Pa Kent from being hung for the rest of the day, where if it doesn't happen, the curse is beaten for 50 years.
The next few times we visited, I always looked for that issue to read. It was something of a security blanket, and interesting story. I had thought about asking cousin Stevie about buying it from him, but never followed up on that. The comic was one of the strong memories of that first trip, along with the DC Slurpee Cups that I tried collecting.