Witty and wise, “A Real Pain” is a masterpiece in a minor key

The bathetic scene will be familiar to many Jews who have traced their roots in eastern Europe. You go in search of der heim, your family’s cradle and the fulcrum of its lore, and discover there is nothing left to see. Amid the vacant lots and communist architecture, there is little even to feel. “It’s so unremarkable,” says Benji (Kieran Culkin) when, in “A Real Pain”, he and his cousin David find their grandmother’s house in Poland.