hidden gnome fish

  1. Open the Run Application dialog (Alt + F2)
  2. Enter “free the fish” (without the quotes)
  3. Press Enter

Another way to invoke it:

  1. Right-click your Gnome panel
  2. Click About Panels
  3. Press the “F” key three times

And another easter egg (really lame, but this one is easy to quit):

  1. Open the Run Application dialog (Alt + F2)
  2. Enter “gegls from outer space” (without the quotes)
  3. Press Enter