A cop sees a guy crawling around under a streetlight and asks him, "Sir, what are you doing?"
  
  The man replies, "Well, officer, I dropped my car keys and I'm trying to find them."
  
  The policeman offers to help, and they search fruitlessly for ten minutes. 
  
  Finally, the officer says, "Are you sure this is where you dropped them?"
  
  "Oh, no, it's not. I dropped them way over there in the parking lot."
  
  Dumbfounded, the cop says, "WHY are you looking over HERE?"
  
  "Well, the light is better over here."