Any of you who know Pink Floyd's "Echoes"; it's the part after the jam section, with the "sea gull"-esque guitar, and that low humming sound. I always thought it was just a synth or keyboard, but upon watching Live at Pompeii, it shows Waters rubbing something onto the strings, at an upper-neck position.

What's he rubbing, how's he rubbing it, and where?

It's been bugging me for a few days now.

If you don't know the part but want to help, go to YouTube, look for Echoes Part 2 Live, should be among the first section. You'll know what I'm talking about when you see it.
Most likely an e-bow.

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I heard something about them rubbing a Zippo on someone's instrument for something.
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It's a slide, and he runs it all through an echo machine or something, can't remember wxactly what it's called. It's on wikipedia