Bewitched (1964)

Season 8: Episode 20

"I know that Tabitha is ready for school, but is school ready for Tabitha?" warns Sam. Tabitha attends school for the first time, and has a pretty hard time because a boy is messing with her. When he refuses to give up, Tabitha turns him into a frog. The teacher Miss Peabody gets on her about the frog and tells her to put it back in the class terrarium. Tabitha grabs the wrong frog and Samantha pops into the school and changes the frogs. When the right frog is brought home, Tabitha changes it back before the boy's mother finds out.