What does Twitter have against Star Wars? We're not quite sure. But a list maintained by the social networking site of passwords you're not allowed to use features that movie title plus many other familiar sci-fi words and phrases.
The taboo terms include:
In addition to the banned movie titles and character names, there are also more generic ones, such as:
Why are these passwords off limits to Twitter users? It's been suggested that perhaps the company detected attackers trying to hack accounts with them.
If you want to see a more complete (though definitely NSFW) list, check out PC magazine.