Easter eggs/references

I was reading an article in cracked about insane easter eggs in movies and t.v. series, one of the entries talked about the an easter egg in The Simpsons about a hidden movie of Reiner Wolfcastle showed in episodes between 1991 and 1993, really some writers are just amazing, I would never thought of something like this, and if it wasn't for this article I would have never known of this little movie.

Many video games include them too, the one I remember the most (because it had way to many :P) is WoW, something the developers like to do is make as many pop culture references they can include, and sometimes they are to obvious like Harrison Jones 

and Adam Eternum

And sometimes they aren't so obvious, like this one

If you click in the white square int the door you read a sequence of number, it is a Lost reference, I didn't get it at first because I wasn't a fan of that series :P

I loved when I found any easter egg or reference, not just in this game or games in general, but also in movies, like this one from Kill Bill... but since Sergio have not seen the second Movie I can't post it, just the link :/

http://www.eeggs.com/images/items/1421.full.jpg