River: Yaya? (means Cassie)
Me:  On a boat (she and Ian are gone for the week, sailing in the Dry Tortugas)
River: Yaya?
Me:  On a boat.
River (giggling): Yaya?
Me:  On a boat.
River: Yaya?
Me:  On a boat.
River (laughing): Yaya?
Me (laughing):  On a boat.
 (repeated for the next 10 minutes or so)

River (sung to the tune of ihavenoideawhatbutaveryloudandcreativesong): Yaya? BOAT! BOAT! BOAT! Yaya. BOAT! BOOOOAAAAAAT. (repeated for the next ten minutes or so).

He loves his big sister A LOT.