Another very obnoxious Hollywood trope
When someone instantly freezes when exposed to the vacuum of space.
Space is cold, yes, but the vacuum is, by definition, empty and therefore is nearly a perfect insulator. You'd freeze eventually, but only through radiating all your heat into space via infrared, which takes a very long time.
I suppose your temp would drop considerably from offgasing and sublimation too, but I don't think that's rapid or significant enough to freeze your body instantly.