A drunkard is looking for the keys to his house under a lamppost near his home. A neighbor comes to the rescue and helps him search. As they don't find anything, the neighbor begins to have doubts:
Are you sure you lost your keys under this lamppost ?
Well no, but there's no way I'll find them elsewhere; it's too dark !
The drunkard is right when it comes to scientific investigations: Don't ever look for obscure solutions, because you can't find anything in the dark vicinity of such solutions. If there's nothing under the lamppost, just give up.
If you're lucky, there might be a flashlight under some lamppost, though.