CodeBLACK is a powerful virus which has several payloads:
August 14: NavaShield laugh for ten minutes
Thanksgiving: Turkey Gobble, followed by NavaShield laugh, again.
December 5: Shows a image saying: Happy birthday SOW! It then uses the NavaShield laugh once again (My god, this is a annoying virus.)
December 10: Once it gets to December 10th, the virus overwrites the MBR with the image of a Pagani Huayra sports car.
December 10th is its most destructive payload.