What is the best spoof movie in your opinion?

Greats mentioned here:
Airplane
Spaceballs
Naked Gun
Young Frankenstein
Blazing Saddles
Robin Hood: Men in Tights

For me it's a tie between:

Not Another Teen Movie - Damn that shite is whack. Well written and hilarious. It obviously is making fun of the other 90s cheesy movies, and directly steals some scenes from them, but it has its own scenes and i laugh every time i watch it.

and

Walk Hard: The Dewey Cox Story - the soundtrack actually has some good songs on it, and the movie itself is hilarious. From start to finish.

Honorable mention to the Scary Movies.

I consider some of these listed as great comedy movies on their own, not just spoofs, although you could make the argument that all comedy is spoof, i was thinking more along the lines of a movie that takes scene for scene from another movie or group of movies and makes fun of them.