It's 2:30 (am) and the lights just dimmed twice to the point the power was about to go off.
.. and the blower on the fan suddenly quit for no reason mid-surge.
.. fan/air conditioner.
Either there's been a wreck and power was diverted, there's been a strong power surge, or the heater/AC just went shit nuts and possibly blew.
It's just a guess, but I'm hoping for the less costly of those options.