A supposed tale from many moons ago, was that during an inspection, the RSM jabs his pace stick into the chest of one soldier.
"There's a shit at the end of this stick, Private."
"Yes sir, not at this end sir".
Said soldier is then promptly marched to jail with much shouting.
As they say, legends are often based on facts, and maybe there was once a young squaddie whose balls were bigger than his brain, but this story is re-told so frequently, I doubt we'll ever know the truth. Still, like all good Military Legends, it lives on.