Chrome says “Resource interpreted as script but transferred with MIME type text/plain.”, what gives?

Question

In FF and all, my javascript works fine. But in Chrome it gives this message:

Resource interpreted as script but transferred with MIME type text/plai

Answer 1

I received this debug message for a sillier reason than the other answers here: This is the error message received when you don't get enough sleep and reference a js file by using the syntax for a css file. As in,

rather than

Thought I'd put this up here because this is the first post that comes up when searching for the error message.