Glasgow Smiles, aka Chelsea Grins, are what the scars on the Joker's face are known as. They originated in Glasgow, Scotland.
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You wanna hear about a good use of an evening? Try handing out razor blade apples on Halloween. Watch the kiddies take that first bite and take pride in all the permanent smiles you create. That's why Glasgow Smiles are on the rise you know. I've started a trend, I'll tell ya.