An efficient enough comedy in which Poitier directs himself as straight man to Cosby's slightly demented taxi driver. The film takes off from the first night of their vacation, when a winning lottery ticket is stolen and their attempts to retrieve it involve them in a movie fantasy world of gangsters. Radiating professionalism rather more than inspiration, it boils down to the sum of its star turns, and with the exception of a fairly nauseous opening sequence sketching in Poitier's 'happy marriage', emerges not unlikeably. Calvin Lockhart etches a neat thumb-nail sketch of a ghetto gangster; Belafonte takes off Brando's Godfather; Roscoe Lee Browne adds a touch of acid to his portrayal of a black congressman. But it's Richard Pryor's fleeting yet totally three-dimensional Sharp Eye Washington, a perspiring and achingly nervous phony private eye, who really walks away with the honours.