Oh, internet challenges...We don't know who starts them or where they come from, but we definitely love it when dancers get involved.

The past few weeks have seen the rise of the #bottlecapchallenge, which involves someone kicking the top off of a plastic bottle. The slow-motion videos show the cap neatly spinning off. Of course, everyone from dogs to celebs have tried their hand (er, foot?) at the challenge. But ballerinas have taken it to the next level. As far as we can tell, Cuban dancer Marlen Fuerte Castro was the first to add a ballet spin: fouetté turns.