Sam McGuffie: Once an NFL hopeful, now an Olympic bobsledder

Sam McGuffie has scored a touchdown at Notre Dame Stadium . His college football career started with him calling Michigan's Big House home. He played before crowds of more than 100,000 at Ohio State, Penn State and Texas.

He's seen big crowds and felt big moments.

And he knows something even bigger may be waiting.

America's latest unique bobsledding phenom is a former running back from the not-exactly-winter-sport-hotbed of Houston. His knack for hurdling defenders made him a YouTube star as a high schooler. He briefly had a taste of life in the NFL, including a stint with the New England Patriots where he got a congratulatory headbutt from Tom Brady.