This is a talk on an interesting study done on kids. They were put in a room with a marshmallow and told to wait and that if they managed to wait 15 minutes without eating the marshmallow, they'd be given another. Years later, it turns out the kids who could restrain themselves from eating the marshmallow were more successful than those that couldn't.
I wouldn't know if the study really holds up, but it's worth it anyway for the video of the kids trying not to eat the marshmallow.
I'd have eaten it.