In Spain, people who rent a car for a short time but keep it for much longer than agreed may face serious legal consequences. Recent cases in cities like Lleida and Seville show that such delays can lead to criminal charges, police investigations, court appearances, and even imprisonment. This situation has become more common as some individuals and tourists take advantage of the legal framework surrounding rental agreements, leading to legal action. In Lleida, a couple is being prosecuted for keeping a rented vehicle for several weeks after it was originally scheduled to be returned after just three days. According to the indictment, they signed a rental agreement in April 2019 with a company, which gave them the car from April 10 to 13. However, they did not return the car on time, and it was discovered by the Urban Guard of Lleida on May 2, 2019—nearly three weeks after the contract ended. The car, valued at 15,850 euros, had damages totaling 691.88 euros. The public prosecutor is seeking one and a half years in prison for the couple, accusing them of improper appropriation of 16,000 euros and money laundering. They are also required to jointly compensate the rental company for the damages. Their trial is scheduled for October 7 before the Provincial Court of Lleida in Catalonia. The legal basis for these charges comes from a Spanish law that penalizes individuals who, to the detriment of others, keep property they were supposed to return, such as a car rented under a contract. The relevant articles of the Spanish Penal Code—articles 249 and 250—set out penalties ranging from fines to several years in prison, depending on the severity of the offense and the amounts involved. In practice, criminal charges are more likely when judges believe the renter is not just late but is acting as if the vehicle is now their own. Recent court decisions highlight this interpretation. In Seville, a driver who returned a vehicle about a month late was sentenced to six months in prison for improper appropriation. In another case, a Citroën C1 rented from Europcar was not returned on time, even though it was found dirty but intact. The rental company calculated 629 euros for the extra days, which the customer did not pay. The court sentenced the individual to six months in prison and revoked the suspension of the sentence due to the failure to voluntarily pay the owed amount. These examples show that in Spain, keeping a rental car longer than agreed can quickly turn a commercial issue into a criminal matter, especially for tourists who decide to keep the car for much longer than intended.