Im convinced Cas pretends not to know certain human things to keep people he doesn’t like away
-like he somehow acquired and learned to use a cellphone all on his own and called Sam as early as season 5
-he learned to drive when he lost his wings
-his angel army had a whole control room setup and bartholomew’s facial recognition software did not phase him one bit
-he somehow found an exacto knife when he needed one and proceeded to carve sigils on his chest
-he managed to stay hidden from angels, demons, BMOL when on the run with Kelly
but the moment you need him to do something he doesn’t want to, he suddenly has no idea how the world works. he turns into a cute little meow meow who can barely tell you his own name. 10/10 the bastard is playing everyone all the time