Linus the Gross

In the Peanuts comic strip, there's a character named Linus.  He's the little boy who's always carrying around his security blanket and who's always sucking his thumb.

Our Sammy's preferred security blanket are socks.  Used and dirty socks.  We often catch him with the toe of his sock caught in his bite, and the rest of the sock still attached to his foot, which is hanging between the ground and his face.

Hand him a sock and it goes directly to his mouth.