This is the famous video of a social experiment involving children by Stanford University. Children were given a marshmallow and told that they could either eat it or wait-- and if they wait they will get two marshmallows- the adult then left the room.
The video is quite funny, but says a lot about kids and learning styles.
Results showed that about half of the kids ate the marshmallow. Kids who didn't eat the marshmallow did better in college, o nthe SAT, or in life. The ones who could handle delayed gratification were generally better in school.