Plasma ball in a microwave
The microwave is about 60 times more powerful than the normal 10W plasma ball power supply, so you would expect everything to be a bit more energetic... It was all changing so fast, I pointed my high speed camera at it.
The biggest effect is the pulsing, which I think is the 50Hz mains increasing and decreasing the power of the microwave.
It is obviously a lot hotter, as the colour is a lot bluer than normal - less energy going into the reds.
It is interesting that there is enough power to support many streamers at once, and they appear to be spreading themselves out around the sphere, so they are probably repelling. Which is what you would expect if you have currents moving through two wires in the same direction you will get a repulsion.
I guess you would expect this to be interesting, and it was definitely pretty cool.