how to make electric shock chewing gum works without pulling?

chewing electric Gum pulling shock
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how to make electric shock chewing gum works without pulling?

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Hi, I’m doing a school project and i’m going to put this electric shock chewing gum i purchased inside this box and people are supposed to put their hand through the hole and get a harmless electric shock. How can i do so without instructing them to pull?so that once they touch they will get the electric shock. i thought of bug zapper but it is too big to place in the box. please help, greatly appreciated.

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