You represent a plaintiff in a car accident case.
Liability is clear.
The only issue is the extent of your client's damages, including a back injury. Two days ago, your client testified in a deposition that he never had been in an accident before and never had any other injuries to his back. Today, you run into a friend of the client's who knows you are representing the client and asks whether you are handling his first or second accident. You call your client immediately. The client admits to you that a year before the car accident, he had hurt his back in a fall at the friend's house.