Suppose you are a defendant in a case in which you are being sued for causing property and personal injury damages as a result of the allegation that you struck the passenger side of their car while the plaintiff was making a left-hand turn. The plaintiff is suing you for total damages of $12,000. The allegations by the plaintiff is that while they were making their left turn, you came out of nowhere and struck their vehicle on the passenger side. The plaintiff can't recall if they were turning on a green light.  

What are some theories that you could assert for a countersuit against the plaintiff, and why?