Wormwood
Revelation
10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;
11 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
I'm not saying that this is true here of this so-called comet but what if?
If it suppose to hit in 2012, that would almost perfect timing for us to get out of here soon and tribulation to start. I don't know.