LOOK: Peyton Manning sports Napoleon Dynamite brown suit

Quarterback Peyton Manning knows that homefield advantage is critical, which is why he busted out his All Business Brown Suit for the Bengals game.

Peyton Manning showed up in Cincy with his business suit. (Twitter)

Big game for the Broncos on Monday night. If they win, they'll remain in the race for the top seed in the AFC, and that means homefield advantage through the playoffs. Quarterback Peyton Manning knows this, of course, which is why he busted out his All Business Brown Suit.

All brown everything. RT @Boyer_Matt: Peyton Manning walks to the Broncos dressing room pic.twitter.com/mua2YnAv3o

— Nicki Jhabvala (@NickiJhabvala) December 22, 2014

That's right, All Business.

@NickiJhabvala @billsdaman88 @Boyer_Matt That's Napoleon Dynamite's PROM SUIT FFS pic.twitter.com/z1XmfrFGKC

— Brooke (@Brooke_Cale) December 22, 2014

In related news, Bengals quarterback Andy Dalton showed up to work wearing jeans and a backpack.