System 6.0.7, 6.0.8, or 7.0 

Take a look through the data fork of the System File (with MacSnoop or MacTools, or open it with MS Word).  (It's short.)

The string "Help! Help! We're being held prisoner in a system software factory!" is in the data fork, with a list of the names of the Blue Meanies (the System 7 developers). (Contributed by Kevin Bolduan and Seth Theriault)