A few years ago, we experimented with a "Live" version of Get-ChildItem that retrieved elegant textual context-based advertisements from the internet as you used PowerShell.
This has been very successful, but unfortunately, a small subset of our trial user population has experienced crashing behaviour due to these new shell modifications. We have been unable to reproduce the issue in our labs, so the users in question have sent us screen casts of the crash. Even still, we've been looking at the code so long that we still can't confirm the problem.
It would really help the PowerShell team if you could take a look and help us identify the issue.
I've posted the screen cast here: http://www.leeholmes.com/projects/powershell_crash/. Make sure you have sound enabled, as that is supposedly an important factor.