How to create scenarios that could be destroyed?

I would like to create scenarios that could be destroyed, but how?? For example, when a car hit a wall, the wall would be destroyed, help me please ...

Thx in Advance

Use this piece of code to destroy a gameObject. To add conditions use if functions.

This page has code that might be just what you want http://unity3d.com/support/documentation/ScriptReference/Collider.OnCollisionEnter.html