Terry Pratchett wrote comic fantasy but he also wrote sense ... and lots of it. He believed in looking into things not just looking at them. He didn't believe that people who think in groups necessarily (ever) come up with the best ideas. He died today and the world is poorer for it.
What does this have to do with Supernatural? You may know already ... but if you have never read Good Omens (a collaboration between Neil Gaiman and Terry Pratchett) and you are a Supernatural fan then you are missing out on a treat!
Good Omens predates Supernatural by a considerable number of years but there are homages to it in many places throughout the series. Not least of which being the demon Crowley, who didn't so much fall as saunter vaguely downward.
Death on the Discworld too, as an anthropomorphic personification ... is a skeleton, but in other ways makes SPN's Death look very familiar :-) Jessie the antichrist seems even more clearly the basis for Adam.
When I used travel across England on a weekly basis back in the day, if you ever heard a stifled snort of laughter by someone reading a book, who looked then vaguely embarrassed at showing themselves up ... and then 2 minutes later did it again ... they were reading a Pratchett.
And (whisper it) Good Omens isn't even Terry's (and Neil Gaiman's) best book! Give both these writers a go!
We will miss you Pterry!