I guess after all these years I can finally confess: I’m a serial killer.
I like to drown rocks.
Warning: this next part is gruesome. Those of a squeamish nature should stop reading.
My “type” was flat-surfaced rocks of a medium build. My technique was to grab the victim between thumb and forefinger. Bending low, I’d fling the victim into the abyss with a side-arm motion, imparting some spin if possible. I’d look on their watery grave with satisfaction if there were multiple splashes on the surface.
There. I feel so much better now.