Yoko Ono Covers Katy Perry's 'Firework' (VIDEO)

Ah, Yoko Ono. Artist. Musician. Fifth Beatle.

Yes, if Yoko Ono didn't exist, you'd have to make her up. And seeing as she does exist, we'll just have to make up parody Twitter accounts and videos like the one above.

For it shows Yoko singing - in a fashion - Katy Perry's hit song 'Firework'. We're particularly liking the authentic 'sounds like it's in an art gallery' effect on the piano. Almost as much as we're liking Yoko's completely and utterly bonkers performance.

Click play, and be prepared to giggle/be bemused. And if it's put you in the mood to hear the original again, well, you're in luck...