Back in the day Key Grip Ron Veto and team were asked to rig a camera for a head on collision point of view for the film "Sleepwalkers".
They accomplished this by rigging a camera that looked into a mirror. The Mirror was rigged in a way that once a car drove into and hit the mirror the rig would break off without affecting the camera rig.
If you look closely on the bottom left you'll see the wooden frame under the mirror is designed to break off on impact.
This is another reason why having a good Grip team is essential and can bring great value to any project.