How to break your wrist - on purpose!

The web is a seemingly unending source of weirdness.  A thread at Reddit today 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!"