Slickers vs. Killers (1991)

Success Hung, an ace cell phone salesman who his feeling the heat from young, up and comer Miss Cheng. One day, Hung witnesses a mob hit. Though the panic-stricken salesman tries to tell his friends about the incident, Hung's gift for exaggeration in the past makes everyone suspicion of his claims except for a relative the deceased who comes to believe that Hung pulled the trigger.

Director: Sammo Hung Kam-bo
Writers: Sze-To Cheuk-hon, Barry Wong Ping-yiu