how to microwave at 2x speed

I heard something unusual the other day amidst the Buffet o’ Blog staff (which is not unusual — well, the staff is, but it’s not unusual to hear something unusual; catch my drift?).  Someone posited the idea that we put some food in a small microwave, turn it on, then put that microwave in a bigger microwave and turn it on.  How do you think that would turn out?