Joe Mixon's touchdown celebration against the Baltimore Ravens poked a little fun at the NFL's home-field advantage rule change.
The multiple playoff rule changes implemented in the wake of the cancellation of the Week 17 game between the Buffalo Bills and Cincinnati Bengals meant that if the Ravens beat the Bengals in Week 18, they would decide home-field advantage with a coin flip immediately following the game.
So, when the Bengals' star running back scored his first touchdown in the first quarter to give the Bengals a 10-0 lead, the running back pretended to flip a coin in the end zone to symbolize the new rule.