A man is walking down the street and he sees a sheep. He leads the sheep to the police station and says to a cop "I found this sheep walking down the street, what should I do with it?" The cop says "Take it to the zoo."

The next day the same cop is out driving around and he sees the man, walking down the street with the sheep on a leash. He pulls over and says to the man "I thought I told you to take that sheep to the zoo." The man responds "I did, yesterday. Today we're going to the movies." :P