In this scene, a woman interrupts a dinner party. She breaks an expensive bottle of ointment open and anoints Jesus. A denarii was the average daily wage during Jesus' time period, so 300 denarii is in the neighborhood of the average yearly wage for a Palestinian. We can understand why some disciples are upset that this bottle is being "wasted" on Jesus. Their argument makes sense; imagine how much good you could do for the poor if you had a year's worth of salary to spare.