Keon Coleman set to start his NFL career.

Coleman and the Buffalo Bills take on the Arizona Cardinals at Highmark Stadium in Week 1.

For many players on the team like Coleman, it will be their first time playing in front of Bills Mafia. Coleman gave the best reaction, though.

New Bills players were shown video of Buffalo fans before taking the field in Orchard Park. Coleman was stunned.

The team shared the video which can be found in the clip below:

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This article originally appeared on Bills Wire: Keon Coleman has perfect reaction to Bills Mafia (video)