The LORD is my shepherd, I shall not be in want.
You probably know this one! And if you don't, it's short :)
Try to repeat it over and over as soon as you can when you get up. Bring your spiral or iPhone with you wherever you go today - while making/eating breakfast and school lunches, while blow drying your hair.
Keep this a habit!
LeRoy Eims on the importance of Scripture memory: "I think two of the master strokes of the devil have been to convince people he doesn't exist, and that Scripture memory is only for children. He remembers the humility of defeat when Jesus Christ, who was tempted in all points like as we are, met him with the Word of God." (What Every Christian Should Know About Growing; p. 26-27)