I'm curious about the special effects in the 1963 version of The Haunting, specifically where the characters breathe into the cold spot and you can see their breath. Does anybody know how they achieved this effect without the wonder of modern CGI? Anybody care to wager a guess? The reason we're perplexed is because you can't see their breath at any other point in the scene and there is no cut to the part where you can see their breath.
ETA I mean, special effects OTHER than making the room cold.