When opening the system with a text program, I used the Program ???->TEXT, you will find a few interesting messages. The program ???->TEXT is shareware but there are also many other text programs that will open general documents, such as the system, that contain text (for example: MacSnoop, MacTools, MS Word, or changing a document in ResEdit to TEXT).
When opening system 7.5 you will receive the below message:
Help! Help! He's STILL being held prisoner in a system software factory!
The Blue Meanie:
Brian McGhie
Also serving time:
Giovanni Agnoli
Eric3 Anderson
[more credits continue]
and Tristan Farnon (because he paid us ten bucks)
Fugitives:
Lars Borresen
Scott Boyd
Jaime Cummins
Brad Post
Will the last person to leave please turn off the lights?
[Unreadable ASCII Text]
The Thread Manager for 68k & PowerPC
THE CAST:
Engineers: Eric & Brad
Qualifiers: BK, RT
Initial Concept: DH
Debugger: ML
Underpaid Process Dude: DF
Animal Handlers: CK, LB
Parents: Mom & Dad
Sisters: KMA, SJP, JRA
Domestic Partner: Amy
Potato Latke Chef: Tam
Bomber Squadron Ldr: DB
City Builder: MF
The Flake: JH
Sekret About Box Critic: JR (That is a 'k' in 'Sekret')
Beermeisters: DR, MB
Slackers: SH, BT, CL, NS, JY
Hardware First Aid: SM
Special Thanks To:
ERJ, KGB, Bear, DL, DB
and everyone who believes!
Dedicated to our fathers:
Eugene Anderson
Frank PostThe Thread Manager
Joy! [more unreadable text]
When opening system 7.1 you will receive a similar message but instead there are various “Blue Meanies”. Check it out, it’s pretty fun.
 
System 7.5 Update "Danook"
In system 7.5 update (should be in system folder if you updated to 7.5.1) there are the same names as above with these additions:
Also serving time: Sam Barone Ian Hendry Paul Wolf Mercenary: John Yen
 
Macintosh Easy Open
Once again using ???->TEXT and opening Macintosh Easy Open I have found a humorous, abnormal, and hidden message between the encrypted text: “Joy! Leave Our Mark On The Tree Weve Been To This Tree Before Preflight Paul” (A few other Apple programs start with “Joy!” also like QTVRPlayer and some Apple Guide Documents, weird huh?)