This riddle says: I’ll smile at you when you smile at me. But if you drop me, I may break. What am I?
The answer is: a mirror.
When you smile into a mirror, your reflection smiles back at you. The mirror is not actually reacting on its own; it simply reflects your expression.
The second clue confirms the answer. Mirrors are usually made of glass, so dropping one can cause it to crack or shatter.
The riddle combines two familiar properties of the same object: reflection and fragility. The first clue sounds almost human, while the second brings you back to a physical object. Put the two together, and a mirror fits perfectly.
