This February 2008 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.
Aircraft: Cirrus SR22. Injuries: 2 Fatal. Location: Lindsay, Okla. Aircraft damage: Destroyed.
What reportedly happened: The CFI and the private pilot were returning to the airport after completing a biennial flight review. Data obtained from the onboard primary flight display revealed that as the airplane approached the airport, it entered a snap roll maneuver and began to descend. The plane did not have enough altitude to recover and subsequently collided with terrain approximately one-quarter of a mile away from the airport. Examination of the airframe and engine revealed there were no pre-mishap anomalies.
Probable cause: The CFI’s failure to maintain control of the airplane, which resulted in an inadvertent stall while maneuvering.
For more information: NTSB.gov

I saw a simulated anatomy of this accident on Avweb. It is very interesting and a reason why I try to stay below 20 degrees of bank in the traffic pattern. Here is the link:
http://www.youtube.com/user/AVweb#p/u/2/7nm_hoHhbFo
As they are explaining the situation, I was cringing, because I could see the problem coming.
Karl