What could be the cause of a disease that makes someone or something fall towards the sky?

Some time ago, I imagined a world with one peculiar disease. People affected by it suddenly "fall" towards the sky, never to be seen again. What could be the scientific cause of such a disease?

Some of its characteristics are:

• it can affect living beings as well as objects and the environment itself: for example, dirt chunks, water, etc.
• it doesn't seem to spread through contact: a few bricks of a chimney can fall upwards, without the rest being affected
• people affected by the disease can still live on the planet, but they'll live upside down
• it is permanent

Can there be a scientific explanation for this disease, even a pseudoscientific one, or does this fall in the "it's magic" category? Feel free to tweak some of the characteristics if needed.

posted over 7 years ago

Lysero‭

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