Damn, why didn't I think of that? I've did some very nice crap to unprotected computers in my time, but mostly harmless stuff like mentioned. Stuffing things into floppy drives are fun, especially diskettes laced with finely ground matchstick heads (the old non-safety matches). Pretty safe, and probably costs only 5 bux to replace . Dangerous part is to grind the heads... You can actually pass those laced floppies around. Just tell your friend its a whole list of websites offering free pr0n.