Wild screeching rising and falling pitch

The kind of sound that stops you from working at home to go out on the deck and say, "What the hell IS that?"

My neighbour's power tool habit is gaining strength. Now he's bought a hand held for his son and they're playing Dueling Sanders like the good ol boys in Deliverance.

It could be used for a number of things including emphasis behind an accident, to add grind to an action sequence or as the sound of an aggressive alien or alien tech weapon.