How to break your wrist - on purpose!

The web is a seemingly unending source of weirdness.  A thread at Reddit today [two years ago] links to a website called "BlurtIt" where ?teens exchange information and ideas.  Here's the top entry under "How To Break Your Wrist" -

Keep hitting it every night and then like do it for two nights and then wake up 1 morn then hit it xtra hard then hit it with a spoon or sumin then tell your mum that ur wrist reli hurts then ask if you can go to the doc he will give you a cast! If you have an x ray there will be sum fracture there! And if you dont get cast tell ur doc that is reli sencitif and that it hurts when you touch it THEN you will get a cast

im doing it right now and this is the second night now so tomoz im going to complain and get a cast YAY!!!

Oh and here are sum things u cud say
u fell and hurt it
u banged it on the table
u jamed it in da door
im using i fell and hurt it

im getting a cast!

I certainly don't understand; it doesn't appear to be a self-harm trend in the usual sense - more of an attention-getting device.  Among the more salient comments in the Reddit thread is this one: "Oh god. I'm never letting my kids ever meet any other kids."  There is also a site called "How To Break Your Bones!"

Addendum:  Reposted from 2010 because this post keeps getting comments, all of which seem to be from preteens or teenagers.   They are obviously not regular readers of the blog; they find the post because it shows up on the first page of a Google search for how to break your wrist.

What should I do about this?  I don't have children of this age and can't get myself into the mindset of a juvenile having problems in school and wanting to break his/her wrist.  I have deleted some comments that I thought were too "instructional" or supportive.

I'd appreciate some adult comments added to the thread, especially from anyone familiar with this phenomenon or knowledgeable re the psychology and sociology of these young people.

Reposted again to bring TYWKIWDBI readers up to date on some of the comments, including a rather sad one last night.  And btw, this post comes up on the front page of a Google search for "how to break your wrist," so keep in mind that any comment you offer may be read by untold numbers of young people.