Nothing sucks worse than being in the middle of a project and watching your computer come to a complete stop.
While it wasn't a complete shutdown, the computer we use for running MediaShout at church completely shutdown the software package during yesterday's service. Quite annoying but made me glad it wasn't my week to run the presentation software. We simply restarted the software and were back on track but an annoyance - especially during worship.
Lifehack.com has 26 tips on how you can keep your computer running and functioning before the crashes occur.