Troy Polamalu is scaring me

And not in a good way:

Pittsburgh Steelers safety Troy Polamalu has not been ruled out of Sunday's key game against the New York Giants despite sustaining the seventh concussion of his career last weekend. Steelers coach Mike Tomlin confirmed Tuesday that Polamalu received a concussion while tackling Bengals running back Cedric Benson on Sunday....

Oh my. His life I know. But after how Andre Waters went out, this stuff scares the hell out me.