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Okay, a weird thing I can't explain: my office chair - sitting in front of a tower fan - seems to want to spin forever, driven by the breeze from the fan.

It only keeps spinning, however, if a box that's fairly heavy is sitting on the chair. With no box, or an identical empty box, the chair stops spinning very quickly.

I have no idea why it does this. I have videos of the control experiments, and it's repeatable