This works particularly well on a forgetful person. I know several people like this and they're constantly asking to borrow pens.
Take a pen with a cap on it. Find a dead insect. Put the dead bug into the pencap. Cap the pen. it's that simple. Then give it to the first person that asks to borrow a pen. If nobody asks you, leave it on a desk and surely somebody will grab it. Upon removing the cap, they will be greeted with a surprise! The bug will most likely be all mashed up too, making it extra gros for the victim.
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