When the Giants beat The Pats in their last Super Bowl matchup, they kept their arms up to limit visibility and tip passes. Brady and Wilfork were mic'd up in Super Bowl XLVI, One of Brady's comments was “It’s like throwing in a forest, dude, those guys arms are like …”
http://espn.go.com/blog/boston/new-england-patriots/post/_/id/4717587/sound-fx-on-super-bowl