The Beatles are probably the most covered act in music history, right? Even so, we doubt you’ve seen a rendition of a Fab Four song quite like this before, though. Bow down before the badass that is 33-year-old medical patient Anthony Kullkamp Dias. Kept awake in an operation to remove a tumour from his brain so that doctors could monitor his motor functions, the Brazilian strummed a number of songs including the timeless Macca-penned ‘Yesterday’. For those of us bereft of musical talent, who struggle on guitar without a surgeon prodding and poking around in our skulls, it’s particularly amazing. Dias – a banker, who’s played the guitar for 20 years and also plays the accordion, keyboards, trumpet and the flute – told reporters afterwards that 90% of his tumour was successfully removed, which is good news. Witness his talents for yourself below but watch out – it gets a bit gruesome towards the end of the clip.