Being the best breakfast cereal is harder than it sounds. Does it stay crunchy in milk? Does it make the milk better? Is the cereal's mascot endearing? But even those qualities aren't enough on their own. To be truly great, breakfast cereal has to be bigger than just breakfast. You should be able to grab handful at any time of day (or night. Especially night.) and, at times, surprise yourself by going through a whole box in one sitting. There's really no such thing as a bad breakfast cereal, but there can only be one best breakfast cereal. So, what is it?