I never could master the trick, but a childhood friend would send fist-sized stones striking a dead tree across a pond with a regular sharp *crack* that once attracted LE to see what in the heck was going on.
23 posted on 06/14/2016 5:05:45 AM PDT by Ketill Frostbeard
("Go not a step from your door unarmed, travel armed for war, you may at any time need a spear." ODIN)
39 posted on 06/14/2016 3:06:29 PM PDT by SunkenCiv
(I'll tell you what's wrong with society -- no one drinks from the skulls of their enemies anymore.)