"When literature student Anastasia Steele goes to interview young entrepreneur Christian Grey, she encounters a man who is beautiful, brilliant, and intimidating. The unworldly, innocent Ana is startled to realize she wants this man and, despite his enigmatic reserve, finds she is desperate to get close to him. Unable to resist Ana's quiet beauty, wit, and independent spirit, Grey admits he just wants to write demos for the Atari 8-bit! What an odd man..."
The original name 15 Shades Of Grey was thought up by Sack, based on the E.L. James book with a similar name. The entire demo is pretty much built around that one pun. Strictly speaking (and please excuse that remarkably weak "pun") there's actually sixteen shades if both black and white are included but that wouldn't be anywhere near as "funny", would it?
Trivia: Fifteen Shades Of Grey relies on a GTIA-specific graphic mode so will have issues on a late model Atari XE machines with the GTIA bug.