Houston Texans coach Bill O'Brien, center, Chief Operating Officer Cal McNair, right, and Houston Chronicle reporter Brian Smith, left, pour ice cold water over their head after an NFL football training camp practice Thursday, Aug. 14, 2014, in Houston. The three were challenged to take the ALS Ice Bucket Challenge to raise money for the ALS Association. The challenge, a social media phenomenon, is part of a program launched by the ALS Association to raise money for fighting ALS, also known as Lou Gehrig's disease. Participants challenge others on video to do it or donate money to ALS before dumping ice cold water over their heads. (AP Photo/David J. Phillip)

Tennessee Titans players take part in the ALS Ice Bucket Challenge and pour ice water over their heads after NFL football practice Wednesday, Aug. 20, 2014, in Nashville, Tenn. Former Titans linebacker Tim Shaw has announced that he has ALS, and visited the facility and witnessed the event to raise money and awareness to battle the disease. (AP Photo/Mark Humphrey)

New York Giants Mathias Kiwanuka (94) and Zak DeOssie dump ice water on quarterback Eli Manning (10) for the ALS Ice bucket challenge after training camp practice at the Quest Diagnostics Training Center on August 14, 2014 in East Rutherford, NJ. (AP Photo/Evan Pinkus)

Former Tennessee Titans linebacker Tim Shaw, right, hugs his former teammate, fullback Collin Mooney, after the Titans players, coaches and staff took part in the ALS Ice Bucket Challenge after NFL football practice on Wednesday, Aug. 20, 2014, in Nashville, Tenn. Shaw has announced that he has ALS, and visited the facility and witnessed the event that raises money and awareness to battle the disease. (AP Photo/Mark Humphrey)

Cleveland Browns cornerback Justin Gilbert reacts after getting ice dumped on him following practice at NFL football training camp in Berea, Ohio Friday, Aug. 15, 2014. The Browns were challenged by the Baltimore Ravens to take the ALS Ice Bucket Challenge, to raise awareness about amyotrophic lateral sclerosis, also known as Lou Gehrig?s Disease. (AP Photo/Mark Duncan)

New York Giants Mathias Kiwanuka (94) and Zak DeOssie dump ice water on head coach Tom Coughlin for the ALS Ice bucket challenge after training camp practice at the Quest Diagnostics Training Center on August 14, 2014 in East Rutherford, NJ. (AP Photo/Evan Pinkus)

Tennessee Titans running back Dexter McCluster takes part in the ALS Ice Bucket Challenge with teammates, coaches and staff and pours ice water over his head after NFL football practice Wednesday, Aug. 20, 2014, in Nashville, Tenn. Former Titans linebacker Tim Shaw has announced that he has ALS, and visited the facility and witnessed the event to raise money and awareness to battle the disease. (AP Photo/Mark Humphrey)

Houston Texans coach Bill O'Brien dunks ice water over his head after an NFL football training camp practice Thursday, Aug. 14, 2014, in Houston. O'Brien was challenged by a reporter to take the ALS Ice Bucket Challenge to raise money for the ALS Association. (AP Photo/David J. Phillip)

Cleveland Browns nose tackle Phil Taylor, left, head coach Mike Pettine, center, and cornerback Justin Gilbert get ice dumped over them after practice at NFL football training camp in Berea, Ohio Friday, Aug. 15, 2014. The Browns were challenged by the Baltimore Ravens to take the ALS Ice Bucket Challenge, to raise awareness about amyotrophic lateral sclerosis, also known as Lou Gehrig?s Disease. (AP Photo/Mark Duncan)

Houston Texans coach Bill O'Brien, center, reacts along with Chief Operating Officer Cal McNair, right, and Houston Chronicle reporter Brian Smith, left, after dunking ice cold water over their heads after an NFL football training camp practice Thursday, Aug. 14, 2014, in Houston. (AP Photo/David J. Phillip)