Mystified By The Donuts

Last night, about 11:03 p.m., someone 'did donuts' in the parking lot behind my bedroom. At first, it was all roaring engine and squealing tires, but it soon vamped up to a possessed mania and a high-pitched wail. The air filled with the scent of burning rubber. Fretting about the danger posed to my parked car, I ran downstairs to get a better glimpse, but only got as far as the yard's gate when their car vanished around the corner. It's never happened before. Will it happen again? A very, very blunt message, but what did it mean? Are the aliens here? Did the terrorists win? Was it a portent?