I ran across this blog entry that catlogues the author's favorite scenes from movies in 2009. I saw most of the movies on his list, but noticed that he didn't have my favorite scene from a movie released in 2009 on that list.
For me, the funniest scene I've seen in a long time, not just 2009, was from Mike Judge's Extract. I present that scene here. If you haven't seen the movie and plan to, you might want to skip this. Otherwise, enjoy.
