Following up on Bkdavy's excellent response...

Some planes are designed to snap roll quite easily.

All too often inexperienced pilots purchase one of these planes and treat it much like a trainer.

On a slow approach, they end up inducing a snap roll, rolling the plane nose first into the ground. They have little control at the point this happens, and the plane is destroyed. In turn the airframe is blamed for the "problem".

A plane that is easy to snap, can perform some interesting aerobatic maneouvers, but this type of plane is not for everyone.

The configuration of the wings greatly affects the snap roll tendancies.