Avery: I know what Carston will be when he grows up....
Carston: What?
Avery: (With a little giggle) An EYEBROW man!

Apparently, she realizes how amazing he is at making crazy faces... by distorting his eyebrows :) I think she has a good suggestion, and I hope he'll use it next time someone asks him what he wants to be when he grows up. An EYEBROW MAN!