Basically in 2004 Pepsi came out with a Holiday Spice flavor. Joe Rogan's sort of sidekick Redban decided to play off of the Supersize Me documentary and drink nothing but Pepsi Spice until Christmas. He made a blog and kept the internet updated. He ended up on radio shows and was eventually threatened by Pepsi. He never actually was doing the challenge but it's still hilarious... to me anyway