During my summer job we had a lady complaining her meter spun too fast. It immediately stopped spinning as we unplugged her roughly 15 year old refrigerator and freezer in the kitchen...
Besides, she complained of her meter spinning much faster than the neighbour's. Well, her meter was a 480 revolutions per kWh type and the neighbour's was a 75 rev/kWh...

On the up side we found her apartment didn't have a ground (her ex who is claimed to be an engineer just ignored the incoming red wire when he rewired and claimed there was no ground available), the RCD didn't work at all and on top of this the evil genius managed to run all the neutrals instead of the hots through the single pole breakers... after seeing that we wondered what kind of engineer that guy could have been... my guess was computer sciences... [Linked Image]