Excretions of male examples of the genus Bos.
Stunt aircraft loses wing mid-flight - snopes.com$this->bbcode_second_pass_quote('', 'F')ake. Avweb Insider concurs.
Video of the Twombly T-6 and Zelazny Zlin crashes show what a one-winged airplane of about that size acts like, and it's nothing like that.
I've seen wreckage from a couple of crashes where a wing was torn off, and it's never as neat a separation as that.
Also, the details of the wing joining surface on the fuselage look like those of an RC model, and very unlike any aerobatic aircraft. Airplanes like the Extras and Sukhoi and such have huge meaty wing spars situated so as to take maximum advantage of the full depth of the wing, and there's nothing of that to the fake airplane depicted in the video.