How would you explain the "Lamb Chop School" of evangelizing? How was it effective for Jay Wilkerson?

Grandpa developed the "Lamb Chop School" of evangelizing. Basically it means offering people something better than they have like offering a lamb chop to a dog who only has an old bone. This worked for Jay when he grabbed some sparklers from the hardware store and burned them when he spoke of Hell. As he talked about Hell, smoke would rise up and people were in awe.