A butterfly flaps its wings, which in turn changes the direction of a gust of wind, which in turn develops into a cyclone, which in turn sinks a major oil tanker at sea, which in turn kills thousands of marine life due to oil poisoning, which in turn causes political activists to force the government to invest billions in preserving the marine-life, which in turn means more money is diverted away from the NHS, which in turn means when I shotgun you and steal the cake, there's no hospital beds free. You develop lead poisoning from the bullets.
I hide the cake in a tree somewhere in the amazon rainforest.