An amusing video has emerged of YouTuber James Ware drinking the "world's strongest coffee".

The footage, shot in London, UK on Thursday, shows Ware taking a pack of 'Death Wish Coffee' to a Starbucks café to ask them to make the "strongest Starbucks ever".

As he drinks his cup, which he says is "blacker than Darth Vader's soul", he says he feels the buzz from the second sip and gets shakes from the caffein.