Source: http://gizmodo.com/disposable-spy-computers-are-disturbingly-easy-and-chea-1014343556
Be honest, how often do you use unsecured Wi-Fi for something you shouldn't? You know, just a quick Facebook login at Starbucks. If you've done it even once, that's too much, because making a secret spy computer that can steal all that data is dumb easy. And cheap to boot.