http://www.homebuildingandrepairs.com... Click on this link for more information about electrical, lighting and building repairs. This is actually something that happened to me a few times and if it's happening to you, then there is a problem with your electrical system. It might be a loose wire or an exposed wire touching another part of the electrical system, switch, outlet, metal electrical box or even an exposed wire that might not be visible when examining the contents of the electrical box. Contact a professional if you don't know anything about your home electrical system to prevent yourself from being electrocuted.