This Ghosts of Hollywood article has some interesting stuff about the so-called Superman Curse. Apparently, a bunch of people associated with the role have suffered accidents and ailments. It’s nothing really astounding though (it all basically sounds coincidental) but I do like this one thing about actor George Reeves (no relation to Christopher Reeve - I don’t think), who played the Man of Steel in a 1950’s tv series:

When the show was canceled, some close friends say that Reeves was despondent, frustrated that his career couldn’t move beyond his role as the Man of Steel - and that’s what led to his suicide at his home in 1959. The suicide conclusion has been hotly disputed, with some believing that Reeves was murdered. Whether it was suicide or murder, Reeves ghost has been seen in his Beverly Hills home. A couple claims to have seen the ghost of Reeves - decked out in his Superman costume - materialize in the bedroom where he died, after which it slowly faded away.