I am constantly amazed at what people lump together as 'science.' As a chemist I have taken 1 biology class in my entire college career. I've taken a couple of physics classes, but I'm certainly no expert in relativity (heck, I'm not even an expert in quantum mechanics). And I've never taken a geology or anthropology class. And yet somehow, I'm still constantly asked "Sam, you're a chemist. How does groundwater diffusion work?" That's a bit like saying "Jim, you majored in French. How to you say 'sleep' in Arabic?"
So how do we combat this universal misunderstanding? Ultimately, it will probably never happen. However, if it ever does, it will probably be media that is responsible. I therefore propose that we push the following taglines, in hopes that they get adopted by Hollywood:
"Dammit Jim, I'm a physicist, not a mechanical engineer!"
"Dammit Jim, I'm a chemical engineer, not a (real) chemist!"
"Dammit Jim, I'm a natural product synthetic organic chemist, not a pharmaceutical organic chemist!"