Finally she popped out of my head completely.
REDRUM: Eagle's Skin Reference
In the skin titled "Sixth Sense" on Eagle, you can easily notice a reference to Stephen King's book "The Shining" (or its adaptation by Stanley Kubrick).
In the book, one of the key characters, a boy named Danny Torrance, sees the word "REDRUM" which reflects as "MURDER" in a mirrored surface. In the film, Danny writes the word on a door, and his mother, Wendy Torrance, sees it in a mirror reflection.
The skin's description states: "All work and no play makes Jack a dull boy." It's believed to be first documented in James Howell's proverb collection in 1659. The plot of the book involves the father of the Torrance family, named Jack, spending a lot of time writing a book, metaphorically leading to his severe burnout. Instead of working on his book, he repeatedly types out this proverb.