I have often felt that software should have a "Credits screen", like movies and video games do. For developers, QA staff, support staff, etc. I opened a bug to create one for our end-user facing software at my last job, but we never actually did it.

Excel 97 had an easier egg where if you entered a certain formula into a certain cell, a flight simulator would be invoked. In the flight simulator, you could fly to see an obelisk that listed the developer credits.

This is real.