Is That Kosher - Joan Rivers lends her voice as Francine's sharp-tongued grandma, Bubba, in this episode about family traditions and communal celebration. Francine's convinced that she can fast on Yom Kippur just like her older sister. But then Arthur wins a free pizza party for all his friends for that very same day! Will Francine be able to resist? With Bubba's help, Francine learns that there's more to the special holiday than making it through...