The state zoo

There was this truck driver who had to deliver 500 penguins to the state zoo. As he was driving his truck through the desert, his truck breaks down. After about 3 hours, he waves another truck down and offers the driver $500 to take these penguins to the state zoo for him. The next day the original truck driver arrives in town and sees the new truck driver crossing the road with 500 penguins walking in single file behind him. The original truck driver jumps out of his truck and asks, "What's going on? I gave you $500 to take these penguins to the zoo!" The new truck driver responds, "I did take them to the zoo. And I had enough money left over so now we're going to see a movie."