What would you bring to show-and-tell?

If you were to find something special/ important or have a significant meaning to you, and share it with a group of acquaintances, what would you show-and-tell? And why did you choose that to show-and-tell and what is its significance to you?

Would like to hear! I’m not sure what I would show-and-tell, perhaps my cell phone, but I thought that isn’t very creative, even though i often use it and find it important.