10 Classic Movie Details You Never Noticed

10. Ash Isn't Drinking Milk - Alien

The Director's Cut of Ridley Scott's Alien features a scene you've possibly seen a whole bunch of times and never given a second thought. 

Shortly after a facehugger-wearing Kane (John Hurt) is brought back onboard the Nostromo, Ripley (Sigourney Weaver) pays a visit to Ash (Ian Holm) in the ship's lab, where she confronts him about flouting quarantine procedure.

After she walks off, we fleetingly see Ash take a swig of a white liquid that one would very reasonably assume to be milk. 

However, given that we later learn that Ash is actually an android seemingly powered by a milky white liquid, it appears that he's actually consuming some of that liquid for self-maintenance purposes.

While we as viewers have no frame of reference for this on an initial viewing, it certainly tracks on subsequent watches. 

And if you weren't convinced yet, Scott even confirmed as much in an interview, referring to what Ash drinks as "liquid with which it feeds its circuits."