After Guardian writers shared their picks, readers responded with films including Gravity, Paranormal Activity and The Road

When the film ended suddenly and silently I found I was gripping the seat armrests and noticed too that nobody moved. I can’t remember a cinema experience where literally nobody moved after a film ended. It was dead quiet for several seconds, I am guessing that many if not most of the audience had actually witnessed the real event on 9/11 on TV, as I had. Visceral cinema a bit too close to the bone, yet sensitive, nonexploitative and direction as tight as it gets. waxanimal

There isn’t a moment throughout when it isn’t twisting one nerve or many, from the depressed middle-aged man (John Randolph) going robotically through life, to the sinister men (Will Geer and Jeff Corey) who offer him a new life (turned into Rock Hudson) – that he can’t refuse, and can’t be allowed to leave.

Left me shaken for days, even though I had been warned. Mariner70

I was both simultaneously claustrophobic and agoraphobic watching it. I would have loved to have seen the 3D version but I think I would have been hospitalised. Monstercat