Helen, I think this hoax, or partial hoax, has been around awhile.

earlier, Helen Wolf, wrote:
>John, it's nice to see your name here.  I recall former 
>conversations concerning water exploding in a microwave.  I've had 
>it bubble, but turn it off when that starts.
>
>Helen
>
>Earlier you wrote:
>>Pat, I'm not saying that water coming out of a cup isn't true.  I'm 
>>saying that water exploding far out of a c far enough to damage 
>>your eye is rare.  I have had water boil over from a cup.
>>John
>

John