Smart GMail – Did you mean to attach files?

Today one of my friend noted a really unnoticed yet creative behavior of GMail. He tried to send an email with body containing “please find attached ….” and he clicked send, GMail instead of sending that email popped-up a message

Did you mean to attach files? You wrote “find attached” in your message, but there are no files attached. Send anyway?

This alerted him that he missed on attaching the files.
Isn’t that really smart and creative thinking! Though a minute thing, but such small things of intelligence makes GMail (Google) an innovator at email services.
Cheers Google!