After the credits of Billy Wilder 's film Witness for the Prosecution , the cinemagoers are asked not to talk to anyone about the plot .
Future viewers will also be able to fully enjoy the unravelling of the mystery .
After the credits of Billy Wilder 's film Witness for the Prosecution , the cinemagoers are asked not to talk to anyone about the plot so that future viewers will also be able to fully enjoy the unravelling of the mystery .