  John is in a grocery store, pushing a shopping cart. At the end of each row in the store there is a large mirror mounted near the ceiling. John notices a reflection of a shopper in one of these mirrors. He cannot see the shopper’s face, but he can see that the shopper’s cart contains a leaking bag of sugar. John utters ‘He is making a mess’ and sets off to find the messy shopper. But in fact, John saw a reflection of himself, and the leaking bag of sugar that he saw was in his own cart. After circling the store, John returns to the spot where he first spotted the messy shopper. He encounters the trail of sugar that he left behind. He then says ‘I am making a mess’, stops his cart, and adjusts the leaking bag of sugar in his cart.