What happens in this video ?
This is what can happen when you pull too many Gs.
September 11th, 1983 - Airshow in Plainview, TX, USA - The pilot was executing a high speed pass over the runway at about 250 ft above the ground. The pilot then began a rapid pull-up and both wings separated just outboard of the engine nacelles. The 'g' load at the time of the wing separations would have been 8.3 g's. The plane, a Partenavia P68C, was not design for so high a G load. The pilot was killed.