Caleb approaches Isaac, who is sitting in his high chair eating Cheerios, and says in a sing-song voice, "Isaac, don't drop Cheewios on da floor!"
Isaac throws one on the floor.
Caleb picks it up, looks at Isaac. Still in a cutesy voice: "I said, don't drop Cheewios on da floor, little boy!"
Caleb picks up the Cheerios off the floor and throws them in the sink.
A few minutes later...
Caleb, to me: "Isaac wants more banana."
Me: "How do you know he wants more banana?"
Caleb: "Cuz he signed 'more'." Caleb walks over to Isaac, who is oblivious, takes his hands and makes the sign for "more". Then he walks over to the other side of the kitchen, reaches up on the counter, and gets a banana. He brings it back and tries to peel it for Isaac.