Given: Barney is a CUTE PURPLE DINOSAUR
Prove: Barney is satanic

    The Romans had no letter 'U', and used 'V' instead for
    printing, meaning the Roman representation would for
    Barney would be: CVTE PVRPLE DINOSAVR

    CVTE PVRPLE DINOSAVR

    Extracting the Roman numerals, we have:
    CV    V  L  DI    V

    And their decimal equivalents are:
    100 5 5 50 500 1 5

    Adding those numbers produces: 666.

    666 is the number of the Beast.

Proved: BARNEY IS SATAN!