What's going on
Almost everyone has met this tiny tragedy: a ballpoint pen with plenty of ink still visible in the cartridge that simply refuses to write. The culprit is usually a small pocket of air that has formed inside the tube, breaking the flow of ink down to the tip.
One person ran into exactly this and asked the internet for both the cause and a fix. The replies quickly settled on a likely villain — writing with the pen angled upward lets gravity pull the ink away from the tip while air sneaks in — and then spiraled into a gentle arms race of increasingly physical remedies, nearly all of them variations on a single theme: apply enough centrifugal force and the ink will return.
The suggestions ranged from swinging the pen by hand, to mounting it on bicycle spokes, to strapping it to a car wheel, to running it through a washing machine. The original poster's eventual solution, however, took an unexpectedly cinematic turn.
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