Stephen Potter's biography tells that, before this happy film version was made, Cary Grant was keen, with American producer Carl Foreman, to make a film about Potter's brilliant (now sadly out-of-print)Oneupmanship books. The problem that confronted Grand and Foreman was that they couldn't find anyway to make the humour "American". In the end they dropped it and this rather Ealing-esque film was made instead. This film is just great fun and a reminder of what British cinema at its best can offer. Thank goodness Grant and Foreman didn't give it the "American" treatment. Thank heavens also for a sterling case, in which Terry-Thomas particularly stands out. Tennis, anyone?