Note to Future Self: Causes are Never Obvious

I installed Vista under Boot Camp today, and my Mac wouldn’t boot into Mac OS X afterwards. It was sitting there on the blue screen with the mouse cursor. Of course I blamed it on boot camp at first. I plugged it into Ethernet (wasn’t getting an Airport connection at this point) and ssh’d into it from another machine. Turns out it was hanging on this umount /Volumes/Foo that I had stuck into rc.local a long time ago. I have no idea why installing Vista would trigger that behavior, but it’s gone from that file now and boots up fine. Who do I talk to about getting that hour of my life back?