[Morbiose]

This issue is particularly infamous for Harvey choosing to self-censor the conclusion to "Punch & Rudy" -- editing the final panel into two, inserting a field of white, and turning it from a fairly average gory twist into a baffling non-sequitur. (A reprint in the 90's featuring the original art confirms the context clues in the staging and in Punchy's dialogue; that was indeed supposed to be Rudy's head he was battering around like a tetherball.)

Why they chose to undercut the story like this of their own accord is unclear, but I think a likely reason for their squeamishness was the Juvenile Delinquency hearings a couple of months prior, where Johnny Craig's Crime SuspenStories cover for EC provoked condemnation and debate over which kinds of severed heads were "tasteful" in the comics medium.

Link to the book: Black Cat 51 (Mystery)