Service Microwaved eggs can burst with flavor. Or just explode. It's your choice. Eggs can be microwaved with good results. Boiling or otherwise hard-cooking eggs in the shell won't work at all.
Pressure builds up from steam being created inside from the heating.
Eventually, the shell won't be able to contain the pressure inside, and the egg will virtually explode. That's the most violent, messiest way to explode an egg in the microwave. Unfortunately, it isn't the only way. J. Cannon, UGA CAES AN EGG YOLK can explode in the microwave, like uncracked eggs, if you don't break the membrane that surrounds it. Steam pressure can build up within the yolk and cause it to explode and create a nasty mess inside your microwave.