Are you looking in the right place?

One evening a man walking home meets a man on all fours.  The man is searching frantically under a streetlight for something on the ground.

“What have you lost?” the passer-by asks.

“I am searching for my key.”

“I’ll help you look,” the passer-by replies and joins the him in his search. Soon both men are down on their knees under the streetlight, looking for the lost key. After some time, the passer-by asks, “Do you remember exactly where you lost the key?”

The man waves his arm back toward the darkness and says, “Over there, in the alley, I lost the key in the alley…”

 Shocked and exasperated, the passer-by jumps up and asks, “Then why are we looking for the key out here in the street?”

“Because there is more light here than in the alley.