Surge Protector Gone Wild!
On Monday morning, somewhere around 4am I think, Dori and I awoke to my computer’s backup power beeping. I also had heard, subconsciously, the circuit breaker flip a few minutes before. I was asleep so it only partly registered, naturally.
I went to the breaker, flipped it back on, and while walking back to bed I heard a loud buzzing coming from near the TV. I looked behind it and saw my surge protector glowing bright red! Not quite the eye of Mordor, but, um, close. Also it smelled pretty terrible.
Naturally I unplugged everything, made sure it wasn’t going to start burning (the case was actually cold to the touch). The next day I ripped it apart to see what happened:
Looks like that circular thingie blew up and caused a surge, tripping the breaker. Edit: Credits to Stephen for the knowledge - the circular thingie is probably a capacitor, and it was likely a short that tripped the breaker.