Supernatural fans know that the show is one of the most quotable television programs out there -- and their promos are no exception.
Take for example this one, which you're seeing first exclusively on EW.
In it, King of Hell, Crowley (Mark Sheppard), informs us of Supernatural's move to Tuesdays and says fans' viewership will earn them his "eternal thanks." But as Castiel warns in his signature deadpan manner, "That is not something you want." (GIF, please!) Honestly, that's not even the best line.