It seems there is a new griefer gift rumored to be making the rounds. If you are given anything, make sure you know who gave it to you before opening or rezzing it. If it is a griefer crasher that you rez, you show up in the SL server logs as the one rezzing the griefer tool, which could create problems for you, i.e., Abuse Reported or banned from SL.
The attribution that this L$L thing was a warning from Simon Linden is untrue. Simon says he never made such a statement, but did comment to be careful opening anything you are given when asked about this specific item.