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A good cup of tea should be an experience. Just fit the Tea Kettle Death Whistle over the spout of your kettle and that experience can be war in 6th to 15th century Mesoamerica. Ready your atlatl and maquahuitl and prepare for the afterlife or prepare to enjoy a nice hot beverage.
Read about the Aztec whistles that inspired this at the following link: http://www.ancient-origins.net/news-mysterious-phenomena/aztec-death-whistles-sound-human-screams-020129
edit: I thought that this might actually whistle, but it doesn't, so please consider it a purely decorative item.