Absolutely. His "gravity is not a force" video led me through a whole range of emotions from "this is ridiculous" to "actually..." to "holy crap, I've been wrong about this my entire life".

In terms of sheer brain-breaking... this is my favourite: https://www.youtube.com/watch?v=ovJcsL7vyrk

But this is the one I think people on HN need to watch most https://www.youtube.com/watch?v=3LopI4YeC4I