Well you must hear that song "POCKET ME ROCKET". This is really true and that rocket may explode anytime if you are not aware.
You might not be knowing this thing but you keep something very explosive with you everyday and that is your SMARTPHONE. You need to be very careful about your smartphone charging. Our smartphone uses the Lithium Battery which is highly dangerous. Look at the video below to see what can happen to you.
Lithium Battery Explosion