One of the easiest ways was to hit any keyboard combination while Avid was saveing stuff on a Mac. That surely made it crash and me go "WTF now I have to redo all the work I just did?"
Only happend on one of the two Avid-apple systems we had...the other just paused and then started to work again.
These macs allready had quite some problems with starting up. Toke them forever, then stoped at bootup like 2 out of 3 times and rebooting didn't worked that well after crashes cause it got you straigth back to reboot several times.
In defance I have to say these where very old Macs and no one bothered to do any kind of system check or any other caretaking for the system. Poor Macs if you ask me.
In school we also got a good number of macs. They where more modern but I also heard some swearing from their places....and I didn't even entered the room.
I got a magical aura that makes Macs crash just by entering the room.
Ok it happend only ones. A college had a new Powerbook or what its called and everyone was standing around it, he was praising it to heaven. Then I just said "Ah its just a PC don't make such a fuss" and the damn thing crashed. Was hilarious as hell and I was never allowed to be near is Laptop again ^_^
Sometimes I get the feeling that computers understand me. When I say "I have to go to bed at XX:XX" These damn things crash just 5min before that time and that on a nearly regular basis.

I have worked on both systems for some time and my experiance could be summed up to about this. Both systems aren't idiotic proved. If you got a person using it who dosn't know how to operate the system it will crash.
Both systems need some attention to it. Keeping a clean system and don't put every trash you find on it.
In the end both are the same.
Or as my math teacher said "The caculator is only so smart as the guy who us it" ^_^