How to Measure a Serving Size

Cereal tastes different with different milks. The look of it is very odd. There should be some marshmallows in it. Wasn't going there. It's like overly crunchy. Like I don't know where the white comes from. Oh my God. That's so sweet. What is it with these Italian sounding cereals? These fall into the cup very softly. You can almost hear the powdered sugar on it as it falls in. My wife right now is like, you're such an idiot. But no, it's cereal so it doesn't count. Can we one day actually measure the actual serving size?