Every morning, I get Cam dressed. We name all the bits of clothes he puts on - jeans, socks, shoes, shirt, sweater... whatever. And some of his shirts have dogs on them, and he'll yell "Abby!" (because all dogs are Abby because that is our dogs name). A few have balls on them, like soccer balls or footballs and he'll declare "Ball!" when he sees those.
I got him new pack of socks that have footballs and soccer balls on them. This morning, he was running around the house proclaiming "Ball! Sock!" but it came out sounding more like Ball! Sack!