Veritaserum: Veritaserum is a very powerful potion that, once taken, leaves the person unable to say anything but the truth. Feared by those involved in the Dark Arts and anyone trying to hide something (and who isn't holding a little white lie or two), this potion should not be used rashly—you might find out more than you were vying for. We recommend using this to finally answer the "does this make me look fat?" question. Veritaserum will prove he really does think you look great and you can finally stop hating on your hips.
Magic objects from the Harry Potter series that, if they actually existed, we'd use for love.