Punters rowing around Finsbury Park’s boating lake were given a shock last week when their idyllic experience was interrupted by an unexpected visitor, 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 (thanks Steven Spielberg).