Half a croissant, on a plate, with a sign in front of it saying '50c'
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Crinkle Whistle

 Remarkably effective.
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Looks like a conventional dog whistle, but when blown emits not a shrill musical note but the amplified sound of plastic food wrapping - the type used for cakes, snacks, etc.

Guaranteed to bring you dog running, as well as all the others within earshot.

—8th of 7, Mar 01 2014

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