John Wall wears Cowboys jersey to the Dallas-Washington game

Uh-oh, this won't make Washington fans happy.

Wizards All-Star point guard John Wall was spotted wearing an Emmitt Smith jersey at the Cowboys–Redskins game on Sunday.

One of the cardinal sins of any pro athlete is to represent a different city while in home turf, it's just bad news all around.

Wall took time to chat with Dallas wide receiver Dez Bryant before he went on the field.

In his defense, he has donned the crimson, yellow and white before — but this is one mistake that Washington fans won't soon forget.

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We'll leave you with some of his Twitter love for you to bask in, as it often goes from funny to astronomically radical in a moment's notice.

https://twitter.com/GarrettFreche/status/777550337771237376?ref_src=twsrc%5Etfw

https://twitter.com/bmdc93/status/777548953541873664?ref_src=twsrc%5Etfw