++CLIENTS PLEASE NOTE: THIS VIDEO HAS BEEN BLEEPED AND LOOPED+br br A construction worker in the UK thought of a novel way of waking up his mate who had fallen asleep on the job.br br Footage shows the builder dozing on the floor of the construction site next to a row of about a dozen concrete slabs standing on their ends. br br The filmer, not impressed by his friend's work ethic, tips on the slabs, causing a domino-like effect. br br The final slab comes crashing down on the sleeping worker's head.br br The filmer writes: "We were waiting to go to work on a housing site and my mate decided to take a nap. br br "We made sure it would be memorable.br br "He wasn't hurt – just surprised."br br The clip was filmed on April 20.