S1, E2: Chueco goes in for a check-up and the vet advises Juan to feed him special canned food for chimpanzees. But Chueco doesn't like the food and is not willing to change his usual diet which consists of eating whatever he wants. Chueco mixes the contents of the cans with Juan's food when he's not looking, but the ape food turns out to have an unexpected side effect on humans.... hair growth! At first, Juan is delighted to see his baldness disappear, but things soon begin to escalate and Juan's hair and beard start to grow completely out of control during a romantic dinner date with Sofía. Once again, Chueco spreads chaos with one of his brilliant ideas.