It's a watermelon exploding. In slo-mo.Perhaps, but the subject at hand is a supercapacitor. I've given some hypothetical specs. If the EEStor ever comes out for real it will a technological revolution and many, many fronts. In addition to cars rail guns probably become real overnight, as will EMP bombs.
Because of the energy density it needs to be safe. For example, gasoline doesn't usually go up from a collision (excuding the Pinto). I suspect this will make a decent flash and a nice boom.
A traditional capacitor bank is not going to be in car or a home (energy resaviour), a super capacitor might.
Can't look at the video right now, but I will later.