When you take a 35mm film canister of the movie "Lucky Number Slevin", and unravel the film to a confortable length in between your two fists, and then you use the sharp edge of the fimstock to slice someone else's head off their body.
When you take a cell-phone antenna and overcharge your mouthwith it until it blows the top of your noodle clean off your neck-gizzard-hole. Cannot be done with antenna-less cellphones. Science of the surge is undetermined but might draw from plate tectonics.