Ciccio wears a hat lent to him by his girlfriend Susy, but it's full of lice, and the whole family becomes infected. Meanwhile, Alice and Giulio plan a night out, but it turns out to be a disaster. Lele and Irene argue after Irene discovers that Lele spent the night with Alice during the wedding in Milan; Irene is involved in a car accident, while Grandpa Libero's motorcycle is stolen.