Fast-forward nine years and he's not any different. He still hums while eating his favorite foods, which is still endearing and much less embarrassing for his mother.
Peter's favorite food to make himself is his "Famous Peter Better Butter Sandwiches". First, get your tongue ready, because cutting cheese requires tongue gymnastics. True concentration requires tongue movement.
Place the (thickly) sliced cheese on two slices of (heavily) buttered bread, preferably Arnold's Dutch Butter Split Top.
(Preferably because 1) it has butter in its name and 2) because it has Dutch in its name).
Put both cardiac arrest-inducing sandwich halves into a toaster oven and toast only until the cheese has just slightly melted. This step is crucial. One must NOT have a gooey cheese sandwich. That would be less than "better".
Remove the halves, place one on top of the other, and enjoy. Repeat. Repeat. Repeat.
Then, take a break and eat lunch.