Probably someone's heart breaking.
Last night around 1:30am or so I was in the kitchen and heard and felt a thump--enough to shake the doors and windows but not loud enough to wake anyone.
My first thought was that something the size of a deer, large dog, or human had crashed into our home at speed.
After a few minutes of window peeking I was starting to get angry at the lack of new information when I finally spotted the reflections of emergency vehicle lights between the houses on the street behind us.
Something was happening.
I opened a window just in time to hear as well as feel a repeat of the original sound followed by a fire truck's pumps cranking up, and had it all figured out.
Seconds later the sound of water spraying, loud hissing, and the sight of a huge cloud of steam rising over the houses confirmed it:
Vehicle fires don't make much noise compared to houses, but they burn really hot and exploding tires have a sound all their own.
They also don't usually warrant sirens in residential areas late at night IF no lives are in danger.
On her way to work Sylvia checked it out and called me to say that the car was still there and looked like a Mazda Miata to her, so I should get pictures.
A sad end to someone's cute and speedy little car.