I found this off an old WIZARD issue. I'd forgotten that James Cameron was attached to the Spider-Man movies at one point, and that he wanted Leonardo DiCaprio to play Peter Parker. The WIZARD guys did this as a joke.
I wonder how that would have gone. Not only was Leo too old to be Peter Parker even then, but he also had too much of a negative reputation (as an actor, not as a person) if I remember right. On the other hand, he actually turned out to be a pretty good actor after all, and since it's James Cameron, maybe the movie would have been the top-grossing movie ever.