I'm going to go with "not done". At least around here. In addition to being in somewhat poor taste, it doesn't have anything to do with anything. Feel free to post it any "interesting things that happened on this date in history" threads you may find, though.
Except that the creature's targeting ring tends to be the first thing that is obliterated by the thousands of spell effects popped by zealous players. I'm not a big fan of the feature but if they do implement it I'd prefer they did it right. Personally the ideal situation seems to be exposing target direction in the lua api so people can just write an add-on for it
ps. Is wishing people a 'happy Hitler's birthday!' still not done or have we gotten over it?