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