How is it that DD can remember a random milk bar where we stopped for an ice cream ONCE, about six months ago, but can't remember where she put her shoes??

Why is it that DS1 knows the exact pitch at which to whinge, that pitch that grates on our nerves as soon as he opens his mouth?

How is it that DS2 can understand "Go and get your shoes and sit down on the floor so I can put them on for you" but can't understand "Please don't yell at me."

Ahh, these are the mysteries that I have pondered today.

How about you? What are you faced with that makes you wonder?