Also, a hardware Easter egg, some Macs had a bunch of signatures inside their cases. Of course, you need a foot long hex wrench to get inside to see.

http://www.cultofmac.com/122408/signed-by-steve-jobs-co-sign...

Oh man, that Torx wrench. Pre-internet, that was nearly impossible to find unless you knew someone that had a Mac repair business.

They were routinely sold under the name "MacCracker" - and had a flat disk with a ridge. Once the screws were out, the ridge would be worked as a lever to separate the edges.

Bottom has some screen shots:

http://www.tcocd.de/Pictures/Micro/Apple/mac128.shtml

I made my own, I got a torx bit set and an extender. The extender would not fit all the way, so I spent an afternoon filing the extender down until it was narrow enough.