What would be a good story line for a cereal commercial?

We are doing this school thing were our language arts teacher is making us do like a commercial skit where we have to persuade the viewer to buy a product. We have to use at least 3 types of a propaganda in the commercial also. Anyway, the product that my two friends and I are doing (2 boys, 2 girls) is cereal. This stuff called Berry Bomb Crunch (Its not real). My job is to make the script but I have absolutely no story line. And it cannot be more than like 5 minutes. So please could you give me a story line that would make a good script and that would include everyone. Please also let me know how I can add the 3 propaganda’s in it. Thanks!