Answer:
I tell people to be careful when handling boxes.
I stay where I am when I go off. What am I?
I am always in front of you but you will never see me
Though desert men once called me God today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
I have thirteen hearts but no body or soul. What am I?
The answer I give is yes, but what I mean is no. What was the question?