Edit: Many have confirmed that a grape cut in half and touching slighting will in fact create plasma when microwaved. It can also be done with a lit match or candle, and apparently helps if you place a pyrex bowl over it. Also, people are saying don’t try to make plasma in a microwave you plan of keeping around. Thanks, Fam!
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I know from first-hand experience that if you microwave an egg in the shell you can blow the door open and the shockwave is enough to fry the electronics. If you poke a pinhole in the bottom of the shell it can become safe to hard boil an egg in the microwave. If you don’t poke a pinhole in the bottom of the shell.