That would be any episode that makes me what to turn off that episode the second I see it. They were smart to put Sam on the floor unconscious before the killer dummy in â€œMannequin 3: The Reckoningâ€ otherwise that would be making this list.
So what did win? They obviously learned that mistake because they did it on â€œLike A Virgin.â€ That episode had many great moments, Dean fretting over Sam in a coma, Sam waking up and they brotherly reunion, Sam beginning to remember things, Dean and his â€œbrave knightâ€ challenge (Sword 1, Dean 0), Dr. Visyak, and the arrival of Mother of All. Itâ€™s the first episode back after a weeks long Winter Hellatus. So you open with, some non-descript chick screaming over shadow monsters in a plane? That didnâ€™t really give us any incentive to go on if we didnâ€™t know that goodness was about to happen.