In 1916, a US amendment was proposed to put all acts of war to a national vote. If you voted yes you would have to register as a volunteer for service in the United States Army.
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In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
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Mico headphones read your brainwaves and select music based on your state of mind.
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There's a café in France which charges €7 for a coffee to rude customers and €1.40 to people who talk politely to staff.
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