Failing speech recognition is almost always funny. Here's some guy trying to write a perl program(!) via the speech recognition in Windows Vista. Enjoy.
Interestingly, I'd say most of the failure is on the user's part here, and Vista is really doing quite well. I haven't used speech recognition in ages, but this makes me kind of eager to try.
Update: The video was gone for a while, but now it's back. Thanks, Magnus.