Mental Floss:

The movie industry has always pushed the limits of technology to create those incredible visual effects we see on the big screen. Specially designed cameras, state-of-the-art computers, and meticulous animatronics are just a few of the tools at the disposal of directors looking to bring their vision to life. But over the years, some of the most iconic effects have been completed using much more modest means, including a little paint, some simple prosthetics, and … a sock? Check out how some of Hollywood’s most memorable special effects shots were created.

I love these behind the scenes secrets of film productions.