That "Sparks" silliness reminds me of part of our machine-gun training: firing tracer ammunition into enclosed spaces in a ship. Those bullets ricocheting like mad, all around in a small space, while the tracer material disintegrated into pieces, was a shocking sight!
I can't imagine anyone seeing that and then EVER enlisting into a sea-going military service. It would terrify them more than bombs, missiles, torpedoes, or drowning!