G: Chicken! (The standard first response.)
M: Um.. we can do that. What else do you want with chicken?
G: 'ow 'bout... carrots!? (A new favorite.)
M: Good choice, buddy, carrots! We can have that. What else do you want?
G: (Mischievous grin) Ice Cream!!? (He really thought he was on a role!)
He got "ogurt" (yogurt) as a substitute and was just as happy with the alternative. He's a smart lil' bugger trying to get what he wants.