There were some obviously false ones - predictions of a terrorist attack in the US, eg. (There were attempts of varying levels of entrapment, but I didn't find any actually successful ones.)
In my opinion, mattnewport's 50% odds weren't that badly calibrated (especially given the Times Square attempt).
As we did last year, use this thread to make predictions for the next year and next decade, with probabilities attached when practical.
Happy New Year, Less Wrong!