Three Things Wrong? Move On!
Saw this tip about buying antiques on the Rules of Thumb Blog, and thought it applied even more to potential clients:
Don't buy a piece of antique furniture if you can find three things wrong with it.
So, if you've just finished your first interview with a potential client, and there are three (or more) things about that person or their case that don't seem right, take a pass. You'll be glad you did.