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A relativly low level, harmless troll I once tried is to ask various linux centered usenet groups about the null device, pretending as if I believed it was a real, physical device.

For example, I asked whether or not I could install Linux on my new computer, because I was using all my serial ports, and didn't know if I could find any USB drivers for a /dev/null

There could be quite a few variations on this theme, as in asking Linux newsgroups whether or not they have /dev/nulls for The Cube, or whether you can get one small enough to attach to your new, ultra small laptop. The possibilities are endless.

This could be a funny prank, if the pranker manages to keep it within acceptable levels of obnoxiousness.