'Madman' in the Bible

so he pretended to be insane in their presence. He acted like a madman around them, scribbling on the doors of the gate and letting saliva run down his beard.

Achish told his officials, "Look, you see a person acting like a madman. Why'd you bring him to me?

Am I lacking madmen that you bring me this one to act like a madman around me? Shall this one come into my house?"