Many reporters in the press box are calling it the most amazing play in Super Bowl history.
Defensive MVP James Harrison jumped a slant route intended for Anquan Bolden and weaved his way 100 yards for a touchdown to put the Steelers up 17-7 on the final play of the half.
The play was reviewed upstairs because it looked like Larry Fitzgerald may have stopped him short of the goal line, but the play stood.
It was a huge momentum-swinging play and may have sealed Arizona's fate. The Cardinals were down 10-7 but looked like they would get a score and go into halftime up 14-10.
Never miss a local story.
Fitzgerald basically ran a pick route to clear space for Boldin, but Harrison didn't rush the passer and slid back into coverage for the pick.
Arizona gets the ball back to begin the second half, so we'll see how they respond.