Justin Smith's hustle plays were a sight to behold

Justin Smith next stop HOF! Utmost Respect & Admiration! 1 of Toughest to ever play. Made Gr8est hustle play I've witnessed! Great teammate!

The announcement that Justin Smith is retiring has brought out plenty of comments from former teammates and coaches. Jim Harbaugh's tweet about the greatest hustle play he has ever witnessed brings to mind one of the biggest 49ers plays of the last four seasons. There were plenty of big plays, but this play against the Philadelphia Eagles will go down as one of the biggest of the Harbaugh era.