Reminds me of a past job 14~ years ago, I was in SAP and spreadhseets pretty much all day so I made my MIRC wallpaper an SAP window and had the font and colors set up similar so if someone snuck up it looked like I was just looking at SAP and I could casually minimize the active chat window.

Similarly I would read Project Gutenberg titles at that job by opening then in notepad and then copy pasting sections into an outlook draft.

AT my current job I could probably get away with playing a MUD, I'm in AS400 terminal windows all day so I could sit there with CMUD on a monitor and no one would have a clue unless they came up and actually read the window (Edit: and actually when I first started here sometimes I'd open a CMD and watch telnet Star Wars).