After scoring a 14-yard touchdown in the second quarter, Mattison faked a hamstring injury and twerked in the end zone, a celebration inspired by NWSL player Lo'eau LaBonta. It went viral, generating millions and millions of views across various social media platforms.
Here was the celebration in question:
Well, the Vikings' fourth-year running back just had one question.
Why is he getting fined for something that the NFL and the Vikings shared across social media?
Indeed, here is what Mattison tweeted when he learned he was getting fined: