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I didn't know there was a snack called PEZ until recently, but my wife said, "I miss my primary school days!" She said.
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Unaware of this, I once took a picture of our hamster by putting it through a toilet paper core. Even then, my wife thought, "This is PEZ!" but she didn't feel the need to say so.
There are so many things in the world that we don't know.