When ever some one steps in, the first thing they smell is a gorgeous rich chocolate bar.  When they are fully inside, some one gives them that exact chocolate bar.  What ever they want, even a unicorn will be there.  But as soon as you walk out of the shop, you will forget everything and all the stuff you get will disappear.  You will also forget everything you ever did in the shop because there is a special spell on the shop.  Even if you go there again, you will think it is a whole new place and the same thing will happen to you when you walk out of the shop again.  You will also be instantly teleported to you house.