OKay, early in the series, SAbrina was given a warning that NO MORTAL could ever discover that she is a witch or she will be turned into a mouse (or some small animal), but when she moves to college, she tells Harvey. Well, a mortal knows and Sabrina should have big round ears!!!

The 1st season said a lot of things that wern't made true for 2nd-. But with Brad, a witch hunter says "You're a witch," that she is turned into a mouse.
;)