Michigan football coach Jim Harbaugh recently got onto a field with Alabama high school football players, going shirtless and khakis and throwing around the football. Harbaugh once did that with the San Francisco 49ers, joining in the action in full pads as the third quarterback.

"It didn't surprise me one bit," Tennessee Titans tight end Delanie Walker said. "Harbaugh doesn't surprise anyone. He does whatever he feels like doing. Truthfully, I think Harbaugh still thinks he's a player, not a coach."

Walker played two seasons with the 49ers for Harbaugh.

"He dressed up in full gear and practiced the whole practice – pads, helmets, everything on. He had the whole uniform on,'' Walker said. We came out and said, "Who is that dude out there? And it was Jim Harbaugh. He had some old high top cleats on. He did pretty good. He just couldn't throw the deep, deep pass."

Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun