The easiest way to get it to happen is using distilled water that you let sit in a cup overnight in the microwave. That gives the cup time to off gas the O2 that is diffused in the water. You don’t even really need distilled water in that case.
The big problem people had was leaving their cup of water for morning tea in the microwave overnight. This led to degassed water in the morning more likely leading to a superheated scalding when you put the teabag in. Once more people were aware of this problem it became less likely to happen.
The easiest way to get it to happen is using distilled water that you let sit in a cup overnight in the microwave. That gives the cup time to off gas the O2 that is diffused in the water. You don’t even really need distilled water in that case.
The big problem people had was leaving their cup of water for morning tea in the microwave overnight. This led to degassed water in the morning more likely leading to a superheated scalding when you put the teabag in. Once more people were aware of this problem it became less likely to happen.