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I have built a custom VirtualBox guest image based on Ubuntu for others to use during a roadshow. It will run on a wide variety of host OSs. How can I prevent passersby from inadvertently closing the guest image while it is running?

Ultimately, I would like the guest image to run in a sort of kiosk mode that requires some know-how to exit.

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So... you want to lock someone in a VM? Any particular reason? And you should specify your host (and maybe guest) OS. –  Bob Jun 4 '12 at 11:06
@Bob We are distributing a bundle for a client to show around on roadshows, and don't have much control over what their host system runs. The guest OS is Ubuntu. –  Kit Sunde Jun 4 '12 at 11:12
Have you considered distrubuting your bundle as a live-cd based on Ubuntu instead? This may serve you better. –  Jeremy W Jun 4 '12 at 14:24
VirtualBox by itself can't do this AFAIK, and if you don't control the host there's even less chance that you'll be able to do it. –  devius Jun 4 '12 at 14:31
@JeremyW Good idea, I'll think about that option the next time we run into the same situation. –  Kit Sunde Jun 4 '12 at 16:46

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