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An oblivitron is a human who thinks they own the aisle. They stand there like a brick wall, cart in one hand, headphones in the other, completely ignoring you while you try to breathe.
I almost ran into a full cart while trying to get the last box of cereal. The oblivitron didn't even blink.
There was this guy in the middle of the snack aisle, blocking the way like he was filming a movie.
I had to side-step a whole oblivitron who was staring at their phone like it was the last thing on Earth.