Pretended to be insane in their presence

1 Samuel 21:10-15
That day David fled from Saul and went to Achish king of Gath. 
Saul has slain his thousands, and David his tens of thousands’?
David took these words to heart and was very much afraid of Achish king of Gath. So he pretended to be insane in their presence; and while he was in their hands he acted like a madman, making marks on the doors of the gate and letting saliva run down his beard.
Achish said to his servants, “Look at the man! He is insane! Why bring him to me?
But David is fed and armed and makes good his escape to the Philistine city of Gath. In danger of recognition, he feigns madness, playing the part so effectively that Achish is completely convinced.
Why?
Under danger situations, David pretends to be insane before the kings and acted like a madman.
People recognized David so he knew he has danger in Gath.
Wisdom and caring the situation are kind or dangerous is needed to every Christian.
How?
Be smart and alert in this generation. For there are many traps and dangers that could let us fall in the world.