Gumnaam

This amazing masterpiece features none other than Mehmood, Manoj Kumar, Pran and Helen. And to nobody's surprise, Mehmood is shown as a psychotic butler of a house on a deserted island.

What's the element of suspense, you ask? Eight airplane crash survivors are stranded on the island, and Mehmood is hospitable enough to provide them with shelter. And as time passes by, each one of the survivors mysteriously dies. Mehmood breaking out of his typical comical shell truly gives you the creeps, and a sound track featuring the famous song 'Gumnaam hain koi' seems like the cherry on top!