Detective School (1979)

Nick Hannigan was a beaten-down private investigator who was reduced to running the Hannigan Detective School and Agency. His students, including loud-mouthed Charlene, elderly Robert Redford, sexy Teresa, shapely Maggie and disco-dancing Silvio, were supposed to show up and have a few lessons in basic detection skills, but instead they kept dragging Nick into investigating real cases and getting themselves into trouble.