In 1 Samuel 16:1 at the end of the verse, the Lord tells Samuel that He has provided Himself a king among the sons of Jesse, the king being Christ.
David is described in 16:12 as "ruddy, with bright eyes, and good-looking." The definition of ruddy means a healthy red color on the face. Maybe from being out in the sun with the sheep?
In 17:4, Goliath is said to be six cubits and a span tall. That is 9 feet and 9 inches. In the next verse his armor is said to weigh 5,000 shekels of bronze. That's about 125 pounds. Then in verse 7 it says the spearhead of his javelin weighs 600 shekels of bronze, which is about 18 pounds. This is showing how large and strong Goliath was in comparison to David.
In 17:37, David had great faith in the Lord, enough to take on a 9'9" giant.
In 17:42, Goliath belittles David, meaning he makes him seem unimportant. Oh how wrong he was.
17:49, David slew Goliath with one tiny stone from a brook. He slew a 9'9" giant with a STONE!
In 18:8-11, Saul is jealous of David because the song the women sang makes David out to be greater than Saul and he became very suspicious of David. I think this situation affected how the evil spirit in Saul normally acts, since he tried to kill David.
In the rest of chapter 18, Saul tries very hard to get David to marry one of his daughters. He tried to trick him into battle before the wedding so that the Philistines would kill him, but God was with David. Saul is a loony.
In chapter 19, Jonathan saves David from being killed by Saul. Saul says 'as the Lord lives, he shall not be killed' and then tries to kill David again! Saul sends three sets of messengers after David and they all begin to prophesy. Saul himself goes after David and prophesies.
In chapter 20, Jonathan and David devise a plan to help David escape from Saul. Saul is angry and tries to kill Jonathan, and Jonathan tells David to flee.
I've never really read any of 1 Samuel and I really enjoyed that. It felt like a movie in my head.