Joining neutral of two ac power meters?
Good initiative :-) - BUT - 

DYING WOULD BE EASY 

IF the circuits are both fed from the same phase
AND the same utility transformer -
AND if the current drawn is within the ratings of the wiring and fusing used     THENelectrically this may not cause a problem. Or may.   

BUT the neutral connection that you made had mains voltage across it and you could easily die if you touched either the feed or the dead circuit while doing this. 

AND the power company may be very unhappy with you doing this.
If it does cause a problem you may be legally and financially liable.