McDonald's success in the 1960s was in large part due to the company's skillful marketing and flexible response to customer demand. In 1962, the Filet-O-Fish sandwich, billed as "the fish that catches people", was introduced in McDonald's restaurants. The new item had originally met with disapproval from Kroc, but after its successful test marketing, he eventually agreed to add it. Another item that Kroc had backed a year previously, a burger with a slice of pineapple and a slice of cheese, known as a "hulaburger", had flopped (both it and the Filet-O-Fish were developed in Catholic neighborhoods where burger sales dropped off markedly on Fridays and during Lent). The market was not quite ready for Kroc's taste; the hulaburger's tenure on the McDonald's menu board was short.