It's a bird, it's a plane it's ...
... this incredible folding, three piece wing on the back of a Porsche Panamera Turbo.
According to the Car Throttle video, the wing comes out at 56MPH to reduce lift. And, it looks like something straight out of Marvel comics,
https://www.facebook.com/carthrottle/videos/vb.113741208636938/1571043529573358/?type=2&theater
Related: Is The Panamera Turbo The Fastest Luxury Sedan On Earth?