Punters rowing around Finsbury Park’s boating lake were given a shock last week when an unexpected visitor interrupted their idyllic experience, with a shark fin emerging from the murky water and hurtling towards their boats. The unlikely nature of the attacks didn’t stop boaters from having a bit of a scare; human instinct clearly took over a few times as a shark fin hurtling towards you is always unnerving. Of course this was a prank featuring a 3m motorised handcrafted monster, created by BAFTA award winning special effects designer Jamie Campbell. This stunt, created by House PR for the launch Shark Week on the Discovery Channel, is a classic example of “prankvertising” – a staple of the PR diet, along with large installations and survey stories. Done well, they are very effective and this stunt has been picked up far-and-wide, with coverage across a range of platforms including national news outlets.