The 3M Force-Field
Invisible force-fields are the stuff of science fiction. However, there's an unusual case in which what seemed to be a force-field (or rather, an "invisible electrostatic wall") was created by accident at a 3M plant in the summer of 1980. The details of this force-field were later described by a 3M engineer in the 1997 Conference Proceedings of the Society of Plastics Engineers.
More info: amasci.com
A web of polypropylene plastic, 21 feet wide, produced for pressure sensitive tape backing in a 3M plant, exhibited a unique electrostatic phenomenon. The large jumbo roll of film was slit to form conventional jumbos 48" to 52" inches wide. As the film was unwound on the slitter, the web formed a "tent" of plastic 21 feet wide and 20 feet high. Within the tent area, a large electrostatic field was produced which formed a physical barrier, not unlike a "force-field". Personnel could not walk under the "tent" of plastic, at certain times of the day, more than half-way without experiencing a physical barrier.
More info: amasci.com
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Category: Unlikely, Improbable and Counterfactual Phenomena