20 Things You Somehow Missed In Terminator 2: Judgment Day

You probably won't be surprised to learn that the steel mill sequence wasn't actually shot in an operational steel mill, with an artificial liquid instead used to simulate the look of red-hot molten steel.

Even more curiously, this substance needed to be kept relatively cool in order to maintain the right look, meaning the set was anything but the sweat-fest you'd expect from a furnace.

And so, the cast had to be routinely sprayed with water between takes to give the impression of sweat - except, that is, for Robert Patrick.

Though the T-800 is indeed shown to sweat because its endoskeleton is covered by synthetic human skin, the T-1000 doesn't because it's a shape-shifter only imitating the look of human skin at a superficial level. Genius.