Cracker Jack is a brand of snack consisting of caramel-coated popcorn and peanuts. It is also well known for being packaged with a "Toy Surprise Inside" of nominal value. This attained pop-culture status with the term "came in a Cracker Jack box" referring to an object of no real value.
Chorus of Take Me Out to the Ballgame:
Take me out to the ball game, Take me out with the crowd; Buy me some peanuts and Cracker Jack, I don't care if I never get back. Let me root, root, root for the home team, If they don't win, it's a shame. For it's one, two, three strikes, you're out, At the old ball game.