1) With 2 runners on, batter hits safely, one runner scored, the other into 3rd safely but with a play. BR turned at 1st, started for 2nd, back and forth a couple times before F1 got the ball, then toward 1st, then toward 2nd and stops.
Plate umpire, still watching all runners and ball possession, calls time concurrently with offense coach saying "d . . m it".
For any non-fastpitch umps, the umpire paid attention and did not kill the play prematurely, so she was out!. Not lookibg for a "gotcha", just applying the rule to a true case of its intent.
Most players, coaches and fans were still applauding the other runners and had no idea what happened.
2) Third game of day, top of first, "pitcher" hits a double. Coach immediately say "blue, courtesy runner". CR is halfway to the base, runner is staring quizically, when PU says "coach, is that a sub?". Coach suddenly remembers that their other pitcher is starting this game and "never mind, never mind, sorry".
3) fill in your own