First of all, the Fanfiction version of Wayward Son killed me.
But by the end of the episode, Dean Winchester killed Death but couldn't get his car out of a pothole when The Darkness was coming (slowly) and AJ is shouting "You've got to be freakin' kidding me!" and I don't know if he was talking to the tv or me, because I'm pointing at the tv and shouting "Expecto Patronum!"
I'll post something that makes sense tomorrow maybe.