The answer, if you are Anna, is: stare at it, push it around your plate, bargain with Mamma as to what you can get for eating one kernel of corn, and shove it to the side of your plate and leave it.
The answer, if you are Elsa, is: pick it up, play with it, figure out that it is roughly the same size as your nostril, pop it into your nostril, stick your finger in there to make sure that you get the corn kernel sufficiently far up the nasal cavity to cause you discomfort, sneeze 8 times in a row, and sneeze a 9th time causing a corn kernel to come flying out of your nostril (missing Mamma by mere millimeters).
Yikes. Is Elsa going to be one of those kids that I'm going to be taking to the doctor's on a regular basis to get things extracted out of her nose?!?!