I was just watching the classic episode "Arena".
Early in the confrontation with the Gorn, the Gorn captain picks up a large boulder and hurls it thru the air. Barely missing Kirk.
A little later, the Gorn captain is shown working on his snare trap for Kirk. He anchors one end of the snare to a large boulder.
A little later, Kirk spies a large boulder near a ledge and with some difficulty rolls it off to smash the Gorn captain.
Is it my imagination or is it the exact same boulder (prop) each and every time??
That is one of my favorite scenes in anything, Star Trek or anything else. The look on Shatner's face is perfect, he really worked hard to sell some of the props, but also Imagine fighting someone that you just about used your full strength to hurl down a rock an he just brushes it off like a spitball and then throws a ten times larger rock UP at you.
In the second part,
I also liked how the sound people tried to help putting in that rumbling grating noise as the thing weightlessly rolls down the hill after the Gorn gets up. A stone that heavy wouldn't roll so easily, it would sink into the ground, IMO.