I'm sure browser plugins come with their own little Quantum Failure Generators or something. I've spent most of today trying to narrow down certain sizing issues with the Windows Media Player plugin across various OS versions and browsers. It was not (and still isn't) fun.
At one point, even Virtual PC 2007 itself crashed.
Then, starting openSUSE 10.2, it decided that it needed to fsck each and every partition just because it hadn't done it for a while. This would have been fine, except that it blocks the boot process for upwards of an hour with no indications on the graphical boot screen.
Now, I'm about to go install some beta software as part of a private beta test program; this can't possibly go wrong, can it?