In Vanessa's garden, there stands a rusty oil tank filled with oil for her old truck. This tank suddenly develops a leak and the oil goes onto the path leading to the house of her neighbour, Bartlett, and also onto his rose bed, killing the roses. Bartlett attempts to clean up the path but leaves a thin film of oil which is very difficult to see. He therefore puts up a notice at the entrance to his property - "Be careful - Watch your step". Kimberly, the postwoman, slips on the path and is injured. Later, Russell, an appliance salesman, who has been told never to come to the house again, also falls and is injured while approaching the house in order to canvass for a sale of a set of encyclopaedias. Using IRAC, Advise Bartlett