Your Favorite Disco Sequence in a Movie

Some pretty good movies got disco sequences whether they happen in a building or under the open sky. These movies do not primarily center on music as a subject. Which of these movies' disco sequences is your favorite? (please vote just for the disco part of the movie)

Let's dance here.

Be careful: some video sequences contain content which is not suitable for children. Epileptics shouldn't watch the linked videos because of strobe lights and flickering light effects.