Not that I'd ever suggest it, but if it accidentally found it's way onto the mailing lists of a few gay porn websites, the gay spam generated will fill one's inbox in hours. Or, if it were say, added to some foreign language gay porn websites, he wouldn't even be able to figure out how to get unsuscribed.
My personal favorite however, is to post a message a few newsgroups, (say alt.gay.jt-ikazuchi, alt.gay.out, alt.gays.jay-denebeim) with something like "I'm an 18 year old new to to the scene, need guidance, can anyone send me some pics and maybe we can talk?", sit back, and let the hilarity ensue.
There's plenty more ideas, but after these, they start to get mean