clinton on a restaurant chain with a big idea that happens to be feeding hungry people all around the country. do you know where the food comes from? it comes from this restaurant. they have a bunch of food, they give it to us. they donate it. and have you ever wondered how come you come home from costco with so many things you didn t set out to buy? tonight carl quintanilla reveals once and for all how they get customers to do that. reporter: call it the costco effect. even if i just come in for one thing, i always end up buying a minimum of $100 worth of stuff. reporter: tonight we ll reveal the secrets of costco, from the thrill of discovery i don t know what that is, but i need three of them. reporter: to the agony of the receipt. i thought i would spend about $25, and i ended up spending over $700. which is why my husband never lets me come here. and the man who makes dreams come true at broadway s biggest hit without ever stepping into the theate