LA/St. Louis Rams: Keith Null (2009)
The former St. Louis Rams had some pretty disastrous seasons in the post Kurt Warner era, but none were as bad as their 1-15 campaign in 2009.
That season featured an ineffective Marc Bulger, and an even-more-ineffective Kyle Boller making starts at quarterback. But neither of them played as badly as rookie 6th-round pick Keith Null, who had to play due to injuries.
Null started four games that year, losing all four of them after averaging less than 142 yards passing in those four starts. Those were the onl four games that Null played in his NFL career.