In all seriousness, many an engineer is paranoid about this.
In my field, pacemaker batteries use lithium technology (generally lithium iodide), and there is always worry that trauma to the device could give internal shorting and fire (gives new meaning to the term, 'heartburn').
Most of the LiI cells for medical devices have a conductive layer that internally dissipates all charge in there is physical deformation, puncture, or shorting. You don't want grampa catching on fire after being hit by a baseball thrown by junior. It is not perfect, and not standard in the aircraft batteries for many reason (generally reduces performance).
I've had long conversations with an aircraft engineer friend about this, cells in the plane have a great deal of electronic protection but in the event of a big disruption (crash), shorting, or overcharge situation, there is a good chance uncontrolled release (fire) could happen.
You've probably seen this video, which is very instructive and shows the dramatic charge density of the batteries.
https://www.youtube.com/watch?v=pizFsY0yjss
Combined with the shell materials in the plane, many worry that small incidents will be potentially less survivable in this plane than the standard aluminum tube.