Ms. Rinsky (guest star Doris Roberts) is back! Actually, she never left. We just haven't seen her in awhile because Frankie's been banned from her class. But when Brick gets a D on a math test, Frankie feels it's time to have another chat with the world's most intimidating teacher. Maybe Ms. Rinsky won't remember her. Nah, she remembers her.

The parent-teacher conference gets off to a rocky start. Then things just spiral downward. To help Frankie understand her young son's homework, Ms. Rinsky offers to teach an evening math class for parents. Mike realizes that his wife was a real goodie-goodie back in her school days. Of course, kissing up to the teacher won't help you solve a math problem while up at the blackboard. Hey, at least Frankie can name all the presidents. Actually, she can name only 16 of them.

Mike does well in Ms. Rinsky's math class, so he's able to help Brick ace his homework assignments. That's why it's so hard to understand why he gets a D-minus on his next test. Frankie blames Ms. Rinsky. She feels she's a bad teacher. After a few late-night beers, Frankie assembles her thoughts in a harsh, rambling email to the school principal, who then asks to meet with Frankie and Mike. Uh-oh.

The reason Brick got a D is because Ms. Rinsky lets them have free reading time once they finish their test. Brick only answered three questions so he could hit his book ASAP. An uncomfortable meeting in the principal's office clues in Frankie to the fact that the school actually has a file on her. That's never a good thing.

Ms. Rinsky believes the way to get Frankie to fall in line is not to ban her, but to embrace her. That's why she's going to be doing all kinds of extracurricular duties from here on out. Frankie will be in charge of the phone tree, school pets and she'll be stuck with crossing guard duty every Tuesday and Thursday. On the bright side, none of those things require any math skills!