Looks like Vimeo is beginning to roll out some custom interaction for viewers. I’m not sure if this kind of thing has been available on vimeo for awhile, but I just came across it for the first time tonight.
Check out this sample below, watch the hilarious video then record your own music by entering keyboard strokes to activate the player.
I wonder if this custom interaction will be an option for vimeo users in the near future!?