I know we all love this movie, and we all love this moment. I just thought you should relive it, just for fun.
What I really love about this scene is how, twenty years or so after its release, a song recorded by The Beatles brings an entire city together. I know it's a movie and these people were probably paid to do this, but all of these people KNOW this song. They LOVE this song. And they are having a good time grooving to it. It's just a universal super feel good moment. It makes me smile every time I watch this movie.
I love the folks dancing down the stairs, the window washer, the busty Bavarian float dancers shimmying their stuff, the little kid hold his hands over his ears and that one guy playing the Sousaphone (a wearable tuba) out in front who is totally getting down!