A glimpse of Ray's backstory from 2x07 almost killed me.
It was so touching, and I love how Ray used his past experience to encourage Walter not to make the same mistake. Now, it makes me wonder if Ray is pretending to be this happy, dumb kind of guy to hide his pain rather than actually being a very dumb person.
The more we learn about him, the more I feel like he's actually very smart but doesn't always feel like it because of what happened to his friend.