Posted by Daniel Steinberg:
Your thread about users having difficulty with .dmg and most recent note about the Be installer reminded me of this Be story from one of their first developer conferences.

Be supported multiple processors early on. They had a cute application that allowed you to turn processors on and off so that if you had a dual processor machine you could see that apps ran faster with both processors on than with just one on. One of the engineers noted that it was possible to turn all of the processor off with this application. Some users complained that this caused the machine to crash.