Peyton Manning's an intense fella on the football field. He appears pretty casual off it, but football is his job and he treats it as such. His intense mindset leads to some interesting facial expressions (known as Manning Faces), which are pretty famous in nature.
For whatever reason, the Broncos quarterback was making a very angry Manning Face after Sunday's win over the Chargers.
Maybe his ankle really hurt. Maybe he really, really wanted the game ball that Pat Bowlen is holding for winning his 300th game as Broncos owner. Or maybe he's just really mad that he's got his own football shoved in between his legs.