It’s not a joke if it’s not entirely clear. But most jokes play off of ambiguity and sudden juxtaposition, so a joke has to be clearly unclear.

“I don’t need to actually make my product safer. All I need to do to make it saf…”

“To make my meal in a box taste better, I decided to tweak the logo, rather than…”

“My meat smells like cat food. Makes me want to lick my own asshole.”

“I always keep a spare set of keys in a spare set of pants that are folded up an…”