Catchers balk?

[chuckfan1]

I had a play where the offensive coach wanted a catchers balk. Now I know that it didnt happen on the play in question, but was wondering if anyone out there has ever called it and why. And if not, I guess it would have to be really blatant, so under what circumstance would you call it?
On my play last week, R3 breaks for home as pitcher starts wind-up. As the pitch comes in, catcher rises out of stance to catch pitch, which was a pitch-out, (so it looks as if either the pitcher recognized it and then threw outside, or the defense thought it might be coming, so they pitched out).
As the catcher reaches over the left-handed batters box to receive the pitch, batter makes half-hearted attempt to bunt. Catcher tags out runner. Offensive coach obviously bummed his brilliant play didnt work wants cathcers balk. Im like "wha?".
Opinions? Examples?