 You're home after a long day, preparing dinner when... Ew! What's that? It smells like rotten eggs. That might be a natural gas leak. It can't be. We don't have any natural gas appliances. Even if you don't use natural gas, that rotten egg odor could be a sign of a leak in your neighborhood. Because gas lines can be buried anywhere. Shut up. No, speak up. If you ever suspect a leak, leave immediately and call 911 and Southwest Gas. Thanks, deep voice narrator. You're very welcome.