No, that was Hercules; wrong religion, buddy.
It is because he wanted to flee Saul. So he acted as if he was insane.
Saul chased David for several years, around 8-10 years. Their conflict began when David defeated Goliath and continued until Saul's death in battle against the Philistines.
David was King in Hebron for several years until the death of Saul. During that time, Saul pursued him intermittently, believing that David threatened his (Saul's) monarchy. At one point, David had to hole up in the territory of the Philistine King Achish. When Achish's men wanted to kill David, he pretended to be insane and they let him be.
Saul lived 70 years
Saul's family line thought that they should still inherit being king even though David was anointed by God to be the next king. So when after Saul and Jonathan and several others of Saul's sons were murdered in battle, Saul's son Ishbosheth took his place while David was king in Hebron for seven and a half years. Then he finally became king over all Israel, stationed in the captured city Jerusalem, for 33 years. so he was a king for a total of 40 years.
Traditional chronology states that David was fleeing from Saul for about one-and-one-half years. See also:More about King DavidWhy didn't David kill Saul?
Nitza Saul is 61 years old (birthdate: June 25, 1950).
Saul Anuzis is 51 years old (birthdate: March 6, 1959).
John Saul is 69 years old (birthdate: February 25, 1942).
Saul Williams is 45 years old (birthdate: February 29, 1972).
Saul Kripke is 70 years old (birthdate: November 13, 1940).
Saul Adler was born on May 17, 1895 and died on January 25, 1966. Saul Adler would have been 70 years old at the time of death or 120 years old today.