Reminds me of a bird I saw on the Gaza cam one day. It was a slow day, the birds were swooping past the camera, I guess they were having fun. When all of a sudden a bird swoops up, stops, hovers like a fucking hummingbird and looks directly at the camera. Then it swooped away. I almost dropped my phone, (not the strangest thing I saw on that camera though).
I have heard mocking birds do a spot on imitation of a car alarms. It could be some kind of mina bird I suppose.