If they are talking about “break” as a sudden thing right at the plate, then that might be so for curve and fastballs. Mariano must have one heck of an optical illusion going for left handers though with that cutter.
Knuckleballs are the pitch that really moves funky, going right,left and right again sometimes, not to mention uneven vertical break. Of course, the ball’s not rotating at all.
Freegards
I have caught knuckle ballers and the problem is, that it is as difficult for the catcher to catch as it is for the batter to hit.