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@goatsarah

I'm sure the person who wrote this caption wasn't thinking of it this way, BUT:

That truck is stuck directly under the main fan blades of a high-bypass turbofan engine, which function essentially as a ducted propeller. They get rotated by a turbine in the jet exhaust and generate much more thrust than the escaping exhaust gasses themselves.

https://en.m.wikipedia.org/wiki/Turbofan