Yeah I was going to say what dan said, Calypso loves to throw her toys down and I have a toy bucket that hangs from the top of her cage and I throw it back in there like I am playing basketball, and she gets all excited and yanks it back out of the bucket and throws it at me again, and this continues on till I am just sick of doing it, lol
You could also get some fruits and veggies, say carrots, corn and a piece of apple...And I will act like a taste a piece, and say "mmmmmm, Carrot" and then put it close to her, and she touchs her beak to it and as she does I repeat it "mmmmm, carrot" and then if she wants to eat it fine, it not on to the next one, like the corn or apple.