Ah yes. Apparently the CIA held a report secret for 30 years, according to which the Ebenezer Scrooge terrorist group was planning an attack on Santa Claus. Of course it was just a joke by a couple of silly spies, but it was kept secret nonetheless. Well, I think it probably had more truth to it than the reports about weapons of mass destruction in Iraq, especially the British version of it.
I found the original article at Warblogs:CC.