Reddit, Sorry, and Trash: My friend: asks for a chip Me: sorry, there’s none left *eats the last oneand walks to trash* My friend somehow knowing there’s chips left: WAIT! There is another How they figure it out?

Reddit, Sorry, and Trash: My friend: asks for a chip
 Me: sorry, there's none left *eats the last oneand walks
 to trash*
 My friend somehow knowing there's chips left: WAIT!
 There is another
How they figure it out?