Yes it already happened a couple of time. It starts boiling either when pulling-out or when putting the tea inside.

Apparently you can do it by turning off the microwave as soon as it starts boiling, turning it on again and repeating until everything boils at the same time and explodes.

If you're using distilled water there's not enough minerals in the water to start the boiling process before the temperature crosses 100 C because microwaves heat it up so fast.

It also doesn't necessarily have to be distilled water, but the the closer it is to just H2O, the higher the chance this will happen.

The water continues to heat ~1 minute after microwaving stops, so I guess it could happen if you take it out very close to the boiling point.

For me it's the fact that my cast iron stove takes ages to heat up