Donovan McNabb Will Be Booed On Thanksgiving:  He will be booed after his first inaccurate pass and he will be booed after his first 3 and out. 

Supporting Evidence:

• The average fan will be more drunk than usual because the game is at 8:15 PM
• The average fan will also be slightly more degenerate, because many people don't want to go to an Eagles-Cardinals game on Thanksgiving night
• Degenerate, drunk fans enjoy booing McNabb
  

I choose to exclusively boo referees when they make really bad calls that affect the game in favor of the other team.