On the episode of The Prisoner "The Girl Who Was Death," Patrick McGoohan stops by his local pub, only to learn — upon finishing his beer — that his drink's been poisoned. He saves himself by rallying like a champ.
If you wish to play similarly cruel pranks on your house guests, Sean Michael Ragan has a guide on how to etch such a glass over at MAKE. Please remember to not actually poison your guests or to sic mysterious balloon monsters on them.
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[Via Neatorama]