Will Smith is getting considerable Oscar buzz for his role as Dr. Bennet Omalu in the upcoming movie Concussion. Will dons a Nigerian accent and transforms into the doctor who took on the NFL after discovering CTE, a disease caused by brain damage in football players who suffer repeated concussions in the course of normal play.

In this clip, Will Smith tells Gugu Mbatha-Raw, who plays his wife Prema, about his dreams of coming to America and how the NFL picked a fight with the wrong person. It’s obvious just how far Will has gone with this role.

Check it out above, and be sure to go see Concussion in theaters Christmas Day.

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