The next time you're grocery shopping (with a handful of coupons, of course) be on the lookout for General Mills cereal boxes that have a blue “Free Movie!” banner on them. All you have to do is buy two boxes, enter the box codes here, and you'll then get a movie ticket valued at up to $12 for participating theaters. I'll give you bonus points if you try to then sneak the boxes of cereal into the theater for a snack.
Participating brands are Cinnamon Toast Crunch, Honey Nut Cheerios, Lucky Charms, Reese's Puffs, and Trix. I currently see the following coupons that will make this deal even more thrifty: