Jackson's Widowbird display, Masai Mara, Kenya. 

You're driving along through the vast grass plains of the Mara, and you notice a black shape moving up and down out of the grass, like a Jack-in-the-Box. That will be a male Jackson's Widowbird (Euplectes jacksoni)displaying to females, using his black plumage and vigorous motion to attract attention. Just wonderful to see!