I was going thru some expired domain name lists earlier when I found that childpornpictures.com had expired at the beginning of the month. My first thought was "what sick fuck registered that?", then "Hmm - a chance to fuck with the perverts"...
How about setting up a fake join4free kiddie porn site, with no content (just a few young looking but 18+ models on the first page enticing the sick fuckers in...)? Sick fucker goes thru the usual routine for a join4free site of entering name and email address, checking email to confirm details and get password, then enters the site using his (confirmed via email) user ID and password to be presented with a one page site saying, basically, "You're a sick fucker, you deserve to fry! Oh, and thanks for confirming your email address and details - we have passed them on to the FBI and Interpol... now
".
Question is, how much trouble would I get in?