**Clear explanation on why
Barney is Satan**

1) Start with the given:

CUTE PURPLE DINOSAUR

2) Change all the U's to V's ( which is proper
Latin anyway):

CVTE PVRPLE DINOSAVR

3) Extract all the Roman Numerals:

C V V L D I V

4) Convert into Arabic values:

100 5 5 50 500 1 5

5) Add up all the numbers:

666

Thus, Barney is Satan.