Harbowl? How about Harbawl?

Every coach at every level gets a little exercised. But the Brothers Harbaugh – squaring off Sunday in Super Bowl XLVII – both get a little inflamed on the sidelines.

Jim's animation bubbled over during the NFC Championship Game with a tremendous nutty after a replay challenge went against the Niners.

John is a tremendous sideline jockey, to the point where he once drew a 15-yard unsportsmanlike penalty in a game at New England back in 2009. That doesn't happen often.

Are they talented coaches? As good as any in the league. Guts? Both men made stone-cold personnel calls this year – Jim going to Colin Kaepernick and John letting go of offensive coordinator Cam Cameron – that were catalysts for their teams.

But it doesn't escape notice that their sideline edge-seeking is very much a part of who they are. And woe to the official who crosses them.

"We're pretty competitive guys," John Harbaugh admits. "It's football. It's a game. If you can't express yourself on the sideline of a football game and be yourself and let your competitiveness out, where can you? Jim has a lot of fun, he's a competitor and he will always be himself."

"To me, they're different," says Mike Pereira, former NFL VP of Officiating and currently a rules analyst for FOXSports. "Jim really is not constant. When he goes, he goes. (Like) the reaction that he had in the (NFC) Championship Game when they didn't reverse the pass that was ruled incomplete on that last drive. He goes quickly off the deep end while John seems to be more constantly off the deep end.

"They just get so wrapped up in the game that it's really incredible when you see that," marvels Pereira. "It's always on TV, people see the way that they act. But, I don't know…"

NFL history is rife with examples of coaches who lose their marbles with regularity. From Madden to Gruden, from Cowher to Coughlin. When a head coach thinks he's getting jobbed, he's going to make his feelings known. Audibly. Demonstrably.