When someone ask you: "why you're in a bad mood today" how do you respond?

For example: i was sitting on my balcony feeling tired, looking at the nature and city, so much things came to my mind and made me feel empty, i was just like floating in the air questioning life and humans and suddenly someone tapped on my shoulder and asked me: "hey what's wrong, why you're silent and looking sad?" Didn't have a straight answer but this song speaks my mind...

Don't be fooled by a person who's smiling and looking happy from the outside because his inside might be the total opposite of what he shows for the rest of the world...

When someone ask you: "why you're in a bad mood today" how do you respond?
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