I asked a friend of mine this hypothetical question during the May 12th 2009 Blue Jays vs. Yankees game. The T.O. crowd booed A.J. Burnett all game long, being his first visit back to the Rogers Centre after signing with the Yanks in the off-season. Jays won 5-1 behind Roy Halladay. Great game.
Oh, and my friend chose to be the T-Rex.