Chick Tracts, whenever I see them in public I make sure to snag them if they're in decent condition. I have kind of a morbid curiosity when it comes to them, they're just so abhorrent in every single way imaginable. Even the relatively tame ones say everyone you know is going to hell to burn for eternity unless they're the right flavour of Christian extremist.

I've even spoken to a pretty shitty street preacher to get my fix. My holy Grail is the one they made about the evils of dungeons and dragons but you have to special order that one so unless another satanic panic kicks off about role playing games I think I'm out of luck

Edit: I started sharing my collection over at the comics com for anyone who's interested