Well, if your lens looks as bad as the one above, this probably won't help you any.
However, a more common lens injury appears to be having the lens forcefully removed from the camera without unlocking it. This can happen for a number of reasons:
- running into a tree with the camera
- knocking the camera off a table while playing football in the house
- trying to force the lens off when it's stuck due to sand lodged in the bayonet mount
- having the camera smacked away by an irate Sasquatch