WHY

[Rez]

See, now I'd have to say that your inability to bring cereal upstairs is not a result of retardation, nor of any sort of bridge-bus-schoolchildren scenario... rather it is simple physics.

As you walk up stairs, your center of gravity is shifting, your arm is moving slightly carrying that shift of force through to the bowl. Hence; the liquid (milk) in the bowl now has an instable center of gravity aswell... and if it is too close to the lip, as the liquid sways back and forth, it spills off the sides.

Solution:

Eat cereal in an anti-gravity environment.

Get a bigger bowl, with the same amount of milk/cereal.

Less milk/cereal in the same sized-bowl.

Carry the bowl and contents on a tray, or plate, thus slightly diffusing the force from your body, and also allowing for protection in case of some spillage.

Eat your DAMNED CEREAL DOWNSTAIRS!!!