To prepare your baby for the fact that life is hard and he may eventually be earning a living playing con-games against tourists on the streets of new York City, you’ll want to introduce him to the shell game.
Take 3 plastic bowls or cups and put them face down on the ground after first showing him which one his cheerio is underneath. switch the positions of the bowls and cups and then let baby flip one over.
I use cups that are somewhat see through, so I’m not really testing Julian’s sense of object permanence, but I think it’s fun to see him make a choice and pick up one of the cups.