The Joker

Charlie has started telling "jokes" lately. Here's a sample:

C: I'm going to float up in the sky with my balloon.
E: Oh yeah?
C: No, only birdies can do that! [Maniacal laughter.]

Or:

C: I will eat this berry? [In reference to a Nandina berry.]
A & C: Noooooo!
C: Because I'm not a squirrel or birdie! [Maniacal laughter.]