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 for Barney would be:

CVTE PVRPLE DINOSAVR

Extracting the Roman numerals, we have:
C V V L D I V

Decimal Equivalents are:
100 5 5 50 500 1 5

Adding those numbers produces: 666

666 is the number of the beast.

Therefore, Barney is Satan.