Why are you looking here? (Mulla)

One night a neighbor found Nasrudin down on his knees looking for something under the street light.

What have you lost, Mulla?

My key, said Nasrudin.

After a few minutes of searching, the other man said, Where did you drop it?

By my house.

Then why, for heavens sake, are you looking here?

There is more light here.