Some years back, a Rallye that was maintained by the company I worked for, lost its wings, killing the the three occupants: the pilot, a boy having the flight as a 16th birthday present and his father, who'd paid for it. The cause? It had been seen a few minutes earlier performing aerobatics. The Aircraft Accident Investigation Board determined that the wing separation had been caused by the pilot exceeding the recommended limitations for that particular weight.
That wasn't a good weekend - another customer flew his AA5 into a stuffed cloud on a cross-country flight.
:^(