The current record holder for loudest crowd in history are the fans of the Seattle Seahawks, who cheered so loud that they induced a mini-earthquake. But that level of noise can permanently damage fans' hearing. Scott Eklund/AP hide caption

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Tickets? Tickets? Anybody need tickets? Some are available to Sunday's Super Bowl in New Jersey at "bargain" prices. Charlie Riedel/AP hide caption

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Former Dallas Cowboy Josh Brent earlier this month. Tony Gutierrez/AP hide caption

toggle caption Tony Gutierrez/AP

Junior Seau sustained many concussions during his career and was suffering from a degenerative brain disease when he killed himself in May 2012. Otto Greule Jr./Getty Images hide caption

toggle caption Otto Greule Jr./Getty Images

Indianapolis Colts quarterback Andrew Luck dives over the goal line in the fourth quarter of his team's 45-44 victory over the Kansas City Chiefs. David Eulitt /MCT/Landov hide caption

toggle caption David Eulitt /MCT/Landov

He's out: Washington Redskins head coach Mike Shanahan on Sunday during the team's loss to the New York Giants. He was fired on Monday. Jeff Zelevansky/Getty Images hide caption

toggle caption Jeff Zelevansky/Getty Images

Kansas City Chiefs linebacker Jovan Belcher's body has been exhumed more than a year after he killed his girlfriend and himself so that his brain can be examined for signs of a degenerative condition linked to repeated concussions. Seth Perlman/AP hide caption

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A Seattle Seahawks fan at Monday night's game, when he and other helped set a new noise record and made the ground rumble. Elaine Thompson/AP hide caption

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Seahawks Fans Cause Earthquake, Set Noise Record
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