Vermes
Advanced Member level 4
The device is dangerous due to high voltage is used!
This kind of effect can be made in a microwave but it can be made better like here: to get a ball lightening a high-current electrical discharges must be made on very small volume of water. This flow of high current makes the water evaporate and float as plasma.
Effects are very impressive but it must be more synchronized with the camera and it should have more energy.
The whole elaboration can be found here: Laboratorium badawczo - rozwojowe PROTON
(the department of physics/high-current).
To imagine the danger, the pictures below show an explosion of a copper wire.
Link to original thread – Laboratoryjny piorun kulisty