If you fake a laugh long enough, you'll actually start to laugh really hard.
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On April Fool’s Day, 1976, the BBC convinced many listeners that a special alignment of the planets would temporarily decrease gravity on Earth. Phone lines were flooded with callers who claimed they felt the effects.
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There's a flower called "Hooker's Lips" that literally looks like a set of hooker's lips.
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In 2012, a squirrel in Fareham, UK got its head trapped in a decorative Halloween skull and scared the crap out of the neighbours.
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