in my myspace profile, i have a picture of myself at a dj gig playing sandpaper instead of records:
this was a noise show at Base Gallery in downtown cincinnati.
someone (evan? matthew? i can't remember) asked, in a myspace comment, something to the effect of, "wouldn't that mess up your needles?"
in short, yes:
the blue needle on the left of the low-quality scanner image is a new needle; the two black ones were old, worn out needles i hadn't yet thrown away. as you can see, the sandpaper completely ravaged the needles. :)
i recorded the set; i want to edit it an release it. when i have a second.
UPDATE: For the curious, i used a variety of sandpaper grits, from (i think) 60 to 200.