The rhyme "Who Stole the Cookie from My Cookie Jar?" is a good hook for teaching 1 Samuel 15 on Saul's disobedience.
Play the game a couple of rounds then begin the lesson. Then stop the game and gather the children around you.
TRANSITION FROM HOOK TO THE BIBLE: Today, we will learn about someone who did something wrong but refused to admit his sin; instead he blamed it on others.
This is an alternative hook that you may use with older kids.
TRANSITION FROM HOOK TO THE BIBLE: Don't you want the ½ marshmallow? Do you think God wants ½ a marshmallow? Today's lesson is about a king who offered half obedience to God. Does God want half obedience?