System 7.0:    System 7:		Big Bang, M80, Pleiades      System 7.0.1:		Road Warrior (in reference to PowerBooks), Beta Cheese
 
            Floppy Disk Trick
Insert a floppy disk and rename it KMEG JJ KS, Like Wow Man.HFS For 7.0! (where the space after 'Man.' is actually an option-space; you'll have to type this somewhere else like the Notepad then cut/paste it into the disk name) or Hello world JS N A DTP (exactly as is).  Eject the disk using Commad-E and double-click on the ghosted disk icon.  The resulting message is “HFS for 7.0 by dnf and ksct”.  In other words it is saying “Hierarchical File System for System 7 by David N. Feldman and Kenny S. C. Tung.”
 
           Huh?
           With ResEdit, take a look at STR# resource -16415 in the System file.
The first string in the resource reads "May you code in interesting times."  This is only in System 7.  

System 7 Tune-Up 1.1.1
The owner resource of this third-Tune-Up release contains the question
everybody asked when it was released: "Again?".