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The many faces of Bill Belichick
In honor of Bill Belichick's birthday, take a look at his sideline expressions.

New England Patriots head coach Bill Belichick stands on the sideline in the first half of an NFL football game against the Baltimore Ravens, Sunday, Dec. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

New England Patriots head coach Bill Belichick looks on during an NFL football game against the Cleveland Browns at Gillette Stadium on Sunday December 8, 2013 in Foxborough, Massachusetts. New England won 27-26. (AP Photo/Aaron M. Sprecher)

New England Patriots head coach Bill Belichick watches from the sideline of a game against the Cincinnati Bengals, Sunday, Oct. 6, 2013, in Cincinnati. (AP Photo/Tom Uhlman)

New England Patriots head coach Bill Belichick listens to a reporter's question during a media availability at the NFL football team's facility in Foxborough, Mass., Wednesday, Dec. 11, 2013. (AP Photo/Stephan Savoia)

New England Patriots head coach Bill Belichick watches in the second quarter of an NFL preseason football game against the Tampa Bay Buccaneers Friday, Aug. 16, 2013, in Foxborough, Mass. (AP Photo/Charles Krupa)

New England Patriots head coach Bill Belichick watches against the Detroit Lions in the second quarter of a preseason football game in Detroit, Thursday, Aug. 22, 2013. (AP Photo/Duane Burleson)

New England Patriots coach Bill Belichick on the sideline in action against the New York Giants in Foxboro, MA. August 29, 2013. (AP Photo/Damian Strohmeyer)

New England Patriots head coach Bill Belichick coaches during an NFL football game against the Pittsburgh Steelers at Gillette Stadium on Sunday November 3, 2013 in Foxborough, Massachusetts. New England won 55-31. (AP Photo/Aaron M. Sprecher)

New England Patriots head coach Bill Belichick watches from the sideline during the closing seconds of an NFL Championship Playoff game against the Denver Broncos on January 19, 2014. The Broncos defeated the Patriots 26-16 in the AFC Championship Game. (AP Photo/Kevin Terrell)

New England Patriots head coach Bill Belichick looks on during an NFL football game against the New York Jets at Gillette Stadium on Thursday September 12, 2013 in Foxborough, Massachusetts. New England won 13-10. (AP Photo/Aaron M. Sprecher)

New England Patriots head coach Bill Belichick leaves after the AFC Championship Game in Denver, Sunday, Jan. 19, 2014. The Broncos defeated the Patriots 26-16 to advance to the Super Bowl. (AP Photo/Julie Jacobson)

New England Patriots head coach Bill Belichick looks on during an NFL football game against the New Orleans Saints at Gillette Stadium on Sunday October 13, 2013 in Foxborough, Massachusetts. New England won 30-27. (AP Photo/Aaron M. Sprecher)

New England Patriots head coach Bill Belichick looks on during an NFL football game against the Atlanta Falcons on Sunday, September 29, 2013 in Atlanta. The Patriots won 30-23. (AP Photo/Paul Abell)

New England Patriots coach Bill Belichick smiles as he answers a question during a media availability at the NFL football team's facility in Foxborough, Mass., Wednesday, Jan. 15, 2014. The Patriots will play the Denver Broncos in the AFC Championship Game Sunday in Denver. (AP Photo/Stephan Savoia)