Empty lamp

Sometimes you will find a lamp laying around in your town. The item is called "empty lamp" and looks as though it would house a genie. Pick up the lamp and venture into the southern area of your town after 9:00pm (following the shoreline seems to work). As you are walking a dialog box will appear from someone named Wisp that will ask you to come closer. When you get closer to him he appears in his true form (resembles a boo from Mario). He will explain that he has lost his lamp, that the lamp is usually where he lives, and will ask you to find it for him because he is too afraid of open spaces to find it himself. Speak to him again with the lamp on your person (it will work whether you have just found it or if you had it on you when you first spoke with Wisp) and he will ask that you go to your attic, a more comfortable environment for him, and rub his lamp there. When you rub the lamp he will grant you a wish that you can choose from four categories: removing all weeds, clearing out cockroaches from your home, an item, or nothing at all. The item category has several sub-categories: furniture, clothing, accessory, or hat.