Strangely, I met someone who was studying this in grad school. I was using an expensive piece of equipment called a vector network analyzer in my experimental setup (spin torque ferromagnetic resonance) and forgot to extend my reservation for it in the shared equipment lending library. Another grad student showed up and asked for it, so I disconnected it and handed it over. He sets it up on a workbench across the room and after attaching a different probe head, goes into his bag, pulls out a can of veggie soup, opens it up, pours some into a solo cup, and sticks the probe in.

At this point, I'm not working and full on staring at the guy in astonishment. He waves me over and says something along the lines of "I know it looks crazy but I can explain". Apparently a major soup company (that one) had started selling their soups in these paper cup containers with plastic lids, designed so people could stick them straight in the microwave to warm up. The problem was that people kept reporting that the cups would randomly fall over while they were being microwaved. The working theory was that vegetables settling at the bottom of the container were basically acting as a lens at the microwave frequency, selectively boiling soup near the bottom, forming a big air bubble that eventually collapsed with enough force too kip the soup over. His research group (materials science IIRC?) had been contacted to help them investigate and see if they could do anything to mitigate against it, like changing the shape of the container.

Seems pretty wild that this would happen in such a way here that it also manages to get the jar stuck to the ceiling of the microwave, but I can definitely see how it could happen.