I can't shut down my computer when MS Word is running, because whenever the computer attempts to quit it, Word crashes and then opens the Microsoft Crash Reporting program. I've gotten used to this, partly because I've been successful reducing my usage of Word to simply formatting my bibliographies when I'm ready to send out a paper.
Recently, however, the crash reporter has started crashing. Fortunately the crash reporter has no crash reporter, so it doesn't look like I'll get stuck in a big loop. My new solution is to simply use MacOSX's "Force Quit" function whenever I want to stop using Word (which is pretty much right after I start using it).