Isaac loves to say 'quack', with varying degrees of propriety. He uses the word to refer to all non-human animals, but especially ducks and dogs. When Daddy points to a duck in a book, Isaac says 'quack' while making the motion of a duck bill with his hand. He also sings the 'quack quack' portion of the song 'Five Little Ducks'.

Isaac and Dylan enjoy playing games together, such as 'magic show' behind a curtain. Also, Isaac loves 'tickling' Dylan, which actually consists of pulling Dylan's hair. Surprisingly, Dylan loves this game too.