Darths and Droids
Back in 2006, a guy named Shamus Young posted a couple of strips of a photonovel-style webcomic with the following...
The following is a spoiler, of a sort; kind of a meta-spoiler. But I nonetheless claim that almost everyone will enjoy Superman Returns more if they know this than if they don't know it; knowing this will help you set your expectations appropriately (and most of you probably know it already anyway). However, I know some people won't want to know it, in which case don't read the rest of this entry.