Device for determining how evil someone is.
In today's world, an absolute necessity

    "So hey, wanna meet for lunch sometime?"

    "Umm.. just a minute here"
    **fumbles around in backpack, brings out lots of electronic testing equiptment and plugs it into his PalmPilot**

    "Wha-?"

    "I need to take an EEG real quick here- you mind?"

    "Uhhh.."

    "Ooh.. the reading's off the scale on this one... I'm sorry. I can't make it. Some other time, perhaps. I have to wash my goldfish."