Check out some of the NFL's craziest fans as they cheer and jeer for their favorite teams.
A Denver Broncos fan wears a mask during the team’s Monday Night Football game against the San Diego Chargers in San Diego.
A Denver Broncos fan cheers for her team against the Cincinnati Bengals.
Tennessee Titans' "flamehead" fans Zachary Key and his father Jimmy Key wait for kickoff.
San Diego Chargers fans painted in white cheer on their team against the Tennessee Titans.
Philadelphia Eagles fans react to the Eagles' loss to the Carolina Panthers.
Fan Jack "Bo" Kennedy waits outside the stadium before the game between the St. Louis Rams and the New England Patriots.
An Oakland Raiders fan sits in shock after his team loses to the Ravens.
A New York Jets fan reacts during his team's game against the New England Patriots.
A New Orleans Saints fan cheers during the second half of the Saints' contest against the San Diego Chargers
New England Patriots fans cheer on their team against the Buffalo Bills.
An Indianapolis Colts fan cheers during the team's game in Indianapolis.
Houston Texans' fans celebrate their win over the Tennessee Titans.
Green Bay Packers fans celebrate a score during their game against the Chicago Bears.
A Philadelphia Eagles fan shouts during the Eagles' win over the Ravens
A fan wears a 'Detroit Lions championship ring hat' as he cheers on his team.
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