These April Fools' Day hoaxes are some of the very best.
5. Smellovision -- This 1965 prank was unveiled in a BBC segment, with an expert demonstrating a new technique in which aromas conjured in a TV studio could be pumped through home television sets. Viewers reported that they could, in fact, catch a whiff of the distinctive scents. But they apparently did not smell the, ahem, bull.
Ralf Manteufel/Wikimedia Commons
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