Sharing

Beckett:  Mommy, I had a drink that I was going to share with you, but then I drinked it all.  Sorry.  So, now you can go to the store and buy another bottle for you to drink.

Allergies

Spencer:  There are people who get allergies.
Me:  Yes, you're right.
Spencer:  Like butterflies!
Me: Butterflies get allergies?!
Spencer:  Yep!
Me:  What do you think butterflies are allergic to?!
Spencer:  Winter!  When it gets cold, butterflies get allergies and die!

Mind reader

The logic of a 4 year old: "But, Mommy! I want you to know what I want you to get for me without me having to tell you what I want!"