The Fresh Prince Of Bel-Air: The Movie
Series 5 episode 5 from 1994.
Will, Carlton and Jazz are playing poker and, in order to hustle Jazz, they tell him an intricate story of how Will witnessed a murder and the family ended up in Alabama on a witness protection scheme.
It works but right at the end, after everyone has gone to bed, there’s a knock on the door.
It’s the killer that Will witnessed.
Until he takes off the mask and underneath it’s Jazz getting his own back.
Movie pages here.