yeh... and this wouldn't happen at low speed, gotta load em up with inertia to make them really pop, i forget how fast but maybe 80km/h at least

the plastic shells on them are made out of ABS plastic which is stiff like polystyrene and resilient like synthetic rubber (same as used in car tires) - so yeah, some extra speed to make its impact include the inertia of this much speed and yeah, they make pretty sparks from the metallic parts inside them, the tube and the circuitboards, get hot enough to catch fire briefly