Hah, I had to Google it...
There have been two 2-0 games in the NFL:
1) The Green Bay Packers defeated the Chicago Bears 2-0 on October 16, 1932.
2) The Chicago Bears defeated the Green Bay Packers 2-0 on September 18, 1938.
The difference is that our 2-0 victory this Sunday will occur in overtime, when Cleveland snaps the ball over their punter's head and out of the endzone.