I stopped making threats like that years ago. I do have a fun time scaring the crap out of people who go too far, though.
Example:
On one of those gaming news sites, an article was posted on cheating in games. I forgot the name of the clan, but basically there was a clan that specialized in cheating in all sorts of games. One guy posted, pissing me off, claiming he enjoyed ruining the games of others in Counter Strike by using the cheats created by that clan and even hinted where you could get them. Having been victim of jerks like him, I decided to play a little prank. This guy was obviously only 15-16 considering his attitude and no way he was part of that clan (he was a blabber).
So what I did was this:
step 1: I looked through all the posts he had made so far on that news site
step 2: I collected personal info he dropped throughout those posts: country, state (he was American) and even what kind of PC he was using.
step 3: I used several search engines to search for his handle or variants and visited every site that used that handle.
I discovered a few things:
- one of the sites had his home town in his profile
- I knew his age: 14
- his e-mail address
So what did I do with all of this?

I sent him a fake email - there used to be a site around which allowed you to send emails from a certain email address. For example I could send one from
bill.gates@microsoft.com. Anyway, I sent him an email from the FBI, stating that as citizen of town *name town* he fell under US jurisdiction and that he had used illegally obtained software to hack copyrighted software etc. etc. and that agents would be around shortly to come pick up his PC and all his other equipment for investigation. I didn't receive any email but for a week or two no further posts were made on any of the forums he visited

.