MailOnline reveals most bizarre 'biohacks' including man with an implant to make his penis vibrate

Video emerged last week of a man getting the QR code from his Tesco Clubcard tattooed on his wrist, so he never missed out on a bargain again. Dean Mayhew paid £200 to get his wrist permanently inked with the code at a tattoo parlour in Chessington, south-west London. The 30-year-old had become tired of missing out on bargains by forgetting his clubcard so decided to make sure he had it on him at all times. Video shows the tattooed QR code failing to scan at a self-service checkout, but working with a handheld scan gun at the counter. Mayhew has become one of the newest members of a growing global community known as the biohackers, or'grinders'.