Random matinee

Hello There

I have a 2 matinees on a object which is connected to a trigger box and when the player enters it plays a matinee but I would like to use one tigger zone to activate one of the two matinees

Concept:
its from the hit TV series called Robot Wars where in series 9 when a robot hits the tyre there is a pointer that points to two sides

Robot Wars Series 9 - Cherub vs PP3D (Front Row POV) - YouTube This video will show a much more detailed example.

Any help will be grand

Thank you