Bizarro Back Issues: The Weirdest Superman/Batman Team-Up Story Ever (1968)
Look: I have read a lot of weird old DC comics. It's kind of my thing. But the great thing about them is that no matter how crazy they get, every time I think I've seen the weirdest thing that comics have to offer, they always somehow manage to top themselves. Case in point: a Cary Bates/Ross Andru/Mike Esposito classic from 1968 that has somehow managed to outdo every other comic I have ever read