u/1FellSloop

I saw this probably 8 or more years ago on YouTube. It was well-produced, quite a few cast members, was probably posted to reddit from time to time. The subject of the video was either music or dance and how it changed, I think over the 20th Century.

At the very end, two of the main people in the video had a giant (maybe 3-foot tall?) bottle of champagne, and it drenches them, the music stops, and they just hold their final position awkwardly for a few seconds staring at the camera until the video cuts off.